Hi,
For those using a Layout inside the Drawer, make sure to set the height property of the Drawer to 100% if you want the Layout to fit the Drawer's dimensions. Without doing that the Layout div's height becomes 1px even when you set its fit property to true.
<div id="drawer-additional-info" class="easyui-drawer" data-options="width:475,height:'100%'" >
<div class="easyui-layout" data-options="fit:true">
<div region="north" data-options="border:false,title:'Comments',collapsible:false" style="height:400px;">
Some text...
</div>
<div region="center" data-options="border:false">
Some text...
</div>
</div>
</div>