[Users] dynamic store on active layers

[François Boussuges]

Hello,
I have different WFS layers on my application and I seek a method to 
make a dynamic store for my gridPanel.
My idea is when I select a layer (I can just select one layer in the 
same time), my grid panel use a specific store of this layer, or the 
store load an other dataset.
Have you an idea to create a variable with the active layer?

Thank you very much!

François