Polymer paper-drawer-panel not accepting toggle from child - polymer

Question

I have a paper-drawer-panel in one element and a toolbar in a child element. On the toolbar is a menu-button, that should toggle the drawer-panel but it does not. How can I tell the paper-drawer-panel to accept a command from the child element?
Parent-element:
<dom-module id="nav-drawer">
<template>
<paper-drawer-panel drawerFocusSelector="">
<div drawer id="drawerbox">
Contents of drawer panel here.
</div>
<div main>
<tool-bar></tool-bar>
</div>
<paper-drawer-panel>
</template>
</dom-module>
Child element:
<dom-module id="tool-bar">
<template>
<paper-toolbar>
<paper-icon-button icon="menu" paper-drawer-toggle></paper-icon-button>
</paper-toolbar>
</template>
</dom-module>
Thanks for your help. I'm new to Polymer.

Answer 1

I found the answer myself:
The tool-bar element I changed as follows, adding attributes and an on-tap function.
<dom-module id="tool-bar" attributes="togdraw">
<template>
<paper-toolbar>
<paper-icon-button icon="menu" on-tap="toggleDrawer"></paper-icon-button>
</paper-toolbar>
</template>
<script>
.....
toggleDrawer: function() {
this.fire('eventFromChild',{togdraw:"drawer"});
}
....
</script>
</dom-module>
And the nav-drawer I changed like accordingly:
<dom-module id="nav-drawer">
<template>
<paper-drawer-panel drawerFocusSelector="" selected="{{selectPanel}}">
<div drawer id="drawerbox">
Contents of drawer panel here.
</div>
<div main>
<tool-bar></tool-bar>
</div>
<paper-drawer-panel>
</template>
<script>
....
properties: {
selectPanel: String
},
ready: function() {
this.addEventListener('eventFromChild', this.toggleDrawer);
},
toggleDrawer: function(event,selectPanel) {
this.selectPanel = event.detail.togdraw;
return selectPanel;
}
....
</script>
</dom-module>