This is a quick sample to accompany this forum thread.  It demonstrates how the blendables Grid class can be used just like the native WPF Grid class, but enhanced with layout animatons.

The sample includes two different scenes (Window1 and Window2).  Window1 demonstrates a SwitchPanel containing several Grid layouts.  Window2 demonstrates a single Grid and its children.  It shows how animatons occur when the layout properties of the Grid and/or its children are updated programmatically.  Both scenes also demonstrate that the blendables GridSplitter can be used with the Grid to affect column and row sizes.

To switch between the two scenes, update the StartupUri property in App.xaml to point at either Window1.xaml or Window2.xaml.