I have no problem tying KeyGestures in a Window type. But when I do
the same code that adds to a custom controls' InputBindings and
CommandBindings nothing happens. Only MouseGestures work to trigger
the command handler.

For some reason, it only fires when the mouse is over the content
portion, not when it is inside the bounds. F.e, if I have a custom
control derived from Control class. I have a OnRender() that draws the
text property using DrawingContext.DrawText(). Only when I'm over the
text the MouseEnter event is fired.

I'm using the MouseEnter event to draw a focus rectangle.