diff --git a/packages/ui-params/src/Param/Enum.tsx b/packages/ui-params/src/Param/Enum.tsx
new file mode 100644
index 0000000000..05867dfee0
--- /dev/null
+++ b/packages/ui-params/src/Param/Enum.tsx
@@ -0,0 +1,113 @@
+// Copyright 2017-2019 @polkadot/ui-app authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { Props as BaseProps, RawParam } from '../types';
+
+import React from 'react';
+import { Enum, TypeDef, createType, getTypeDef } from '@polkadot/types';
+import { Dropdown } from '@polkadot/ui-app';
+
+import Params from '../';
+import Bare from './Bare';
+import Static from './Static';
+
+type Props = BaseProps;
+
+type State = {
+  def: TypeDef | null,
+  options: Array<{ text: string, value: string }>,
+  sub: Array<TypeDef>,
+  type: string | null
+};
+
+export default class EnumParam extends React.PureComponent<Props, State> {
+  state: State = {
+    def: null,
+    options: [],
+    sub: [],
+    type: null
+  };
+
+  static getDerivedStateFromProps ({ type: { type } }: Props, prevState: State) {
+    if (prevState.type === type) {
+      return null;
+    }
+
+    const sub = getTypeDef(createType(type).toRawType()).sub as Array<TypeDef>;
+    const options = sub.map(({ name }) => ({
+      text: name,
+      value: name
+    }));
+    const def = prevState.def || sub[0];
+
+    return {
+      def,
+      options,
+      sub,
+      type
+    } as State;
+  }
+
+  render () {
+    const { className, defaultValue, isDisabled, isError, label, style, withLabel } = this.props;
+
+    if (isDisabled) {
+      return <Static {...this.props} />;
+    }
+
+    const { def, options } = this.state;
+    const initialValue = defaultValue && defaultValue.value
+      ? defaultValue.value instanceof Enum
+        ? defaultValue.value.type
+        : Object.keys(defaultValue.value)[0]
+      : defaultValue;
+
+    return (
+      <Bare
+        className={className}
+        style={style}
+      >
+        <Dropdown
+          className='large'
+          defaultValue={initialValue}
+          isDisabled={isDisabled}
+          isError={isError}
+          label={label}
+          options={options}
+          onChange={this.onChange}
+          withEllipsis
+          withLabel={withLabel}
+        />
+        {def && (
+          <Params
+            onChange={this.onChangeParam}
+            params={[{ name: def.name, type: def }]}
+          />
+        )}
+      </Bare>
+    );
+  }
+
+  private onChange = (value: string): void => {
+    const { sub } = this.state;
+
+    this.setState({
+      def: sub.find(({ name }) => name === value) || null
+    });
+  }
+
+  private onChangeParam = ([{ isValid, value }]: Array<RawParam>): void => {
+    const { onChange } = this.props;
+    const { def } = this.state;
+
+    if (def) {
+      onChange && onChange({
+        isValid,
+        value: {
+          [def.name as string]: value
+        }
+      });
+    }
+  }
+}
diff --git a/packages/ui-params/src/Param/Null.tsx b/packages/ui-params/src/Param/Null.tsx
new file mode 100644
index 0000000000..cffc214e31
--- /dev/null
+++ b/packages/ui-params/src/Param/Null.tsx
@@ -0,0 +1,22 @@
+// Copyright 2017-2019 @polkadot/ui-app authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { Props } from '../types';
+
+import React from 'react';
+
+export default class Null extends React.PureComponent<Props> {
+  componentDidMount () {
+    const { onChange } = this.props;
+
+    onChange && onChange({
+      isValid: true,
+      value: null
+    });
+  }
+
+  render () {
+    return null;
+  }
+}
diff --git a/packages/ui-params/src/Param/Static.tsx b/packages/ui-params/src/Param/Static.tsx
new file mode 100644
index 0000000000..15c18c3949
--- /dev/null
+++ b/packages/ui-params/src/Param/Static.tsx
@@ -0,0 +1,39 @@
+// Copyright 2017-2019 @polkadot/ui-app authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { WithTranslation } from 'react-i18next';
+import { Props as BareProps, RawParam } from '../types';
+
+import React from 'react';
+import { Static } from '@polkadot/ui-app';
+import translate from '@polkadot/ui-app/translate';
+
+import Bare from './Bare';
+
+type Props = BareProps & WithTranslation & {
+  defaultValue: RawParam,
+  withLabel?: boolean
+};
+
+class StaticParam extends React.PureComponent<Props> {
+  render () {
+    const { className, defaultValue, label, style, t } = this.props;
+    const value = defaultValue && defaultValue.value && defaultValue.value.toString();
+
+    return (
+      <Bare
+        className={className}
+        style={style}
+      >
+        <Static
+          className='full'
+          label={label}
+          value={value || t('empty')}
+        />
+      </Bare>
+    );
+  }
+}
+
+export default translate(StaticParam);
diff --git a/packages/ui-params/src/Param/Struct.tsx b/packages/ui-params/src/Param/Struct.tsx
new file mode 100644
index 0000000000..e459fbafb9
--- /dev/null
+++ b/packages/ui-params/src/Param/Struct.tsx
@@ -0,0 +1,85 @@
+// Copyright 2017-2019 @polkadot/ui-app authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { Props as BaseProps, RawParam } from '../types';
+
+import React from 'react';
+import { TypeDef, createType, getTypeDef } from '@polkadot/types';
+
+import Params from '../';
+import Base from './Base';
+import Static from './Static';
+
+type Props = BaseProps;
+
+type State = {
+  defs: Array<TypeDef>,
+  type: string | null
+};
+
+export default class StructParam extends React.PureComponent<Props, State> {
+  state: State = {
+    defs: [],
+    type: null
+  };
+
+  static getDerivedStateFromProps ({ type: { type } }: Props, prevState: State) {
+    if (prevState.type === type) {
+      return null;
+    }
+
+    const defs = getTypeDef(createType(type).toRawType()).sub as Array<TypeDef>;
+
+    return {
+      defs,
+      type
+    } as State;
+  }
+
+  render () {
+    const { className, isDisabled, label, style, withLabel } = this.props;
+
+    if (isDisabled) {
+      return <Static {...this.props} />;
+    }
+
+    const { defs } = this.state;
+    const params = defs.map((type) => ({ name: type.name, type }));
+
+    return (
+      <div>
+        <Base
+          className={className}
+          label={label}
+          size='full'
+          style={style}
+          withLabel={withLabel}
+        >
+          &nbsp;
+        </Base>
+        <Params
+          onChange={this.onChangeParams}
+          params={params}
+        />
+      </div>
+    );
+  }
+
+  private onChangeParams = (values: Array<RawParam>) => {
+    const { onChange } = this.props;
+
+    if (onChange) {
+      const { defs } = this.state;
+
+      onChange({
+        isValid: values.reduce((result, { isValid }) => result && isValid, true as boolean),
+        value: defs.reduce((value, { name }, index) => {
+          value[name as string] = values[index].value;
+
+          return value;
+        }, {} as { [index: string]: any })
+      });
+    }
+  }
+}
diff --git a/packages/ui-params/src/Param/Unknown.tsx b/packages/ui-params/src/Param/Unknown.tsx
index 409c55d962..a3add02d01 100644
--- a/packages/ui-params/src/Param/Unknown.tsx
+++ b/packages/ui-params/src/Param/Unknown.tsx
@@ -2,40 +2,24 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { WithTranslation } from 'react-i18next';
 import { Props as BareProps, RawParam } from '../types';
 
 import React from 'react';
-import { Static } from '@polkadot/ui-app';
-import translate from '@polkadot/ui-app/translate';
 
-import Bare from './Bare';
 import BaseBytes from './BaseBytes';
+import Static from './Static';
 
-type Props = BareProps & WithTranslation & {
+type Props = BareProps & {
   defaultValue: RawParam,
   withLabel?: boolean
 };
 
-class Unknown extends React.PureComponent<Props> {
+export default class Unknown extends React.PureComponent<Props> {
   render () {
-    const { className, defaultValue, isDisabled, isError, label, name, onChange, onEnter, style, t, type } = this.props;
+    const { className, defaultValue, isDisabled, isError, label, name, onChange, onEnter, style, type } = this.props;
 
     if (isDisabled) {
-      const value = defaultValue && defaultValue.value && defaultValue.value.toString();
-
-      return (
-        <Bare
-          className={className}
-          style={style}
-        >
-          <Static
-            className='full'
-            label={label}
-            value={value || t('empty')}
-          />
-        </Bare>
-      );
+      return <Static {...this.props} />;
     }
 
     return (
@@ -57,5 +41,3 @@ class Unknown extends React.PureComponent<Props> {
     );
   }
 }
-
-export default translate(Unknown);
diff --git a/packages/ui-params/src/Param/findComponent.ts b/packages/ui-params/src/Param/findComponent.ts
index 59b0c34ce2..5c93da9cf6 100644
--- a/packages/ui-params/src/Param/findComponent.ts
+++ b/packages/ui-params/src/Param/findComponent.ts
@@ -2,20 +2,25 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { TypeDef, TypeDefInfo, UInt, createType } from '@polkadot/types';
 import { Props, ComponentMap } from '../types';
 
+import BN from 'bn.js';
+import { TypeDef, TypeDefInfo, createType, getTypeDef } from '@polkadot/types';
+
 import Account from './Account';
 import Amount from './Amount';
 import Balance from './Balance';
 import Bool from './Bool';
 import Bytes from './Bytes';
 import Code from './Code';
+import Enum from './Enum';
 import Hash from './Hash';
 import Moment from './Moment';
 import Proposal from './Proposal';
 import KeyValue from './KeyValue';
 import KeyValueArray from './KeyValueArray';
+import Null from './Null';
+import Struct from './Struct';
 import Text from './Text';
 import Tuple from './Tuple';
 import Unknown from './Unknown';
@@ -35,16 +40,20 @@ const components: ComponentMap = ([
   { c: Bool, t: ['bool'] },
   { c: Bytes, t: ['Bytes'] },
   { c: Code, t: ['Code'] },
+  { c: Enum, t: ['Enum'] },
   { c: Hash, t: ['CodeHash', 'Hash', 'SeedOf', 'Signature'] },
   { c: KeyValue, t: ['KeyValue'] },
   { c: KeyValueArray, t: ['Vec<KeyValue>'] },
   { c: Moment, t: ['Moment', 'MomentOf'] },
+  { c: Null, t: ['Null'] },
   { c: Proposal, t: ['Proposal'] },
   { c: Text, t: ['String', 'Text'] },
+  { c: Struct, t: ['Struct'] },
   { c: Tuple, t: ['Tuple'] },
   { c: Vector, t: ['Vector'] },
   { c: Vote, t: ['Vote'] },
-  { c: VoteThreshold, t: ['VoteThreshold'] }
+  { c: VoteThreshold, t: ['VoteThreshold'] },
+  { c: Unknown, t: ['Unknown'] }
 ] as Array<TypeToComponent>).reduce((components, { c, t }) => {
   t.forEach((type) => {
     components[type] = c;
@@ -57,8 +66,15 @@ export default function findComponent (def: TypeDef, overrides: ComponentMap = {
   const type = (({ info, sub, type }: TypeDef) => {
     switch (info) {
       case TypeDefInfo.Compact:
+      case TypeDefInfo.Option:
         return (sub as TypeDef).type;
 
+      case TypeDefInfo.Enum:
+        return 'Enum';
+
+      case TypeDefInfo.Struct:
+        return 'Struct';
+
       case TypeDefInfo.Tuple:
         return 'Tuple';
 
@@ -77,9 +93,12 @@ export default function findComponent (def: TypeDef, overrides: ComponentMap = {
   if (!Component) {
     try {
       const instance = createType(type);
+      const raw = getTypeDef(instance.toRawType());
 
-      if (instance instanceof UInt) {
+      if (instance instanceof BN) {
         return Amount;
+      } else if ([TypeDefInfo.Enum, TypeDefInfo.Struct].includes(raw.info)) {
+        return findComponent(raw, overrides);
       }
     } catch (error) {
       // console.error(error.message);
diff --git a/packages/ui-params/src/Params.css b/packages/ui-params/src/Params.css
index 4fe161feea..158878423f 100644
--- a/packages/ui-params/src/Params.css
+++ b/packages/ui-params/src/Params.css
@@ -17,6 +17,10 @@
 .ui--Params-Content {
   box-sizing: border-box;
   padding: 0 0 0 1.75rem;
+
+  label .withEllipsis {
+    white-space: normal;
+  }
 }
 
 .ui--Param-text {
diff --git a/packages/ui-params/src/initValue.ts b/packages/ui-params/src/initValue.ts
index dac323e781..d53bdca222 100644
--- a/packages/ui-params/src/initValue.ts
+++ b/packages/ui-params/src/initValue.ts
@@ -5,7 +5,7 @@
 import { RawParam$Value } from './types';
 
 import BN from 'bn.js';
-import { Bytes, Hash, TypeDef, TypeDefInfo, U8a, UInt, createType } from '@polkadot/types';
+import { Bytes, Hash, TypeDef, TypeDefInfo, U8a, createType, getTypeDef } from '@polkadot/types';
 
 export default function getInitValue (def: TypeDef): RawParam$Value | Array<RawParam$Value> {
   if (def.info === TypeDefInfo.Vector) {
@@ -15,11 +15,20 @@ export default function getInitValue (def: TypeDef): RawParam$Value | Array<RawP
       ? def.sub.map((def) => getInitValue(def))
       : [];
   } else if (def.info === TypeDefInfo.Struct) {
-    console.error(`Unable to determine default type from Struct ${JSON.stringify(def)}`);
-    return void 0;
+    return Array.isArray(def.sub)
+      ? def.sub.reduce((result, def) => {
+        result[def.name as string] = getInitValue(def);
+
+        return result;
+      }, {} as { [index: string]: RawParam$Value | Array<RawParam$Value> })
+      : {};
+  } else if (def.info === TypeDefInfo.Enum) {
+    return Array.isArray(def.sub)
+      ? { [def.sub[0].name as string]: getInitValue(def.sub[0]) }
+      : {};
   }
 
-  const type = def.info === TypeDefInfo.Compact
+  const type = [TypeDefInfo.Compact, TypeDefInfo.Option].includes(def.info)
     ? (def.sub as TypeDef).type
     : def.type;
 
@@ -84,12 +93,18 @@ export default function getInitValue (def: TypeDef): RawParam$Value | Array<RawP
     case 'Extrinsic':
       return new U8a();
 
+    case 'Null':
+      return null;
+
     default: {
       try {
         const instance = createType(type);
+        const raw = getTypeDef(instance.toRawType());
 
-        if (instance instanceof UInt) {
+        if (instance instanceof BN) {
           return new BN(0);
+        } else if ([TypeDefInfo.Enum, TypeDefInfo.Struct].includes(raw.info)) {
+          return getInitValue(raw);
         }
       } catch (error) {
         // console.error(error.message);