changing focus not working

changing focus not working

Hi, 

I have a main grid and in that grid there are many components, I want to keep the focus on one component all the time, even use make a mouse lick on other component, at mouseleftbuttonup, i am trying to set the focus back to my default place, i.e.

mystargrid.Focus()

it do not change the focus once user make a mouse click on other components, any idea to force the focus back to my desired place after use mouse click ?

Regards

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