1. Use LayoutPanel instead of DockLayoutPanel. LayoutPanel allows you
to add two widgets that occupy the same space. If you don't specify
the position of each child widget, each child widget will occupy the
entire space available. From this moment all you need to do is hide
one of them depending on where users clicks.
2. When necessary, detach one widget and attach the other one. In each
case these widgets should pick up their size automatically from their
parent widget - there is no need to set their size explicitly as long
as you use widgets that support resize.
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