Hi, I have created a widget application that has a widget_tree structure. The tree includes three different types of nodes. Each node type generates a unique event. I want to show a different compound widget on the right depending on which type of node is selected. I am currently mapping and unmapping them but this doesn't do quite what I want. My problem is that the nodes, even when unmapped still cannot occupy space on the screen. I want the widgets to replace each other, at the moment they appear and dissapear but are positioned next to each other rather than on top of each other. Is there a way to 'layer' widgets in such a way that I can show widgets one at a time occupying the same space? Thanks a lot