Its the Cell's Click() and DblClick() that will fire. If you want to centralize your code, put the Click() and DblClick() in the Grid. In TextBox Object's Click() and DblClick(), put this code in:

In the Click()

This.Parent.Parent.Click() && for the Grid.Click()

In the DblClick()

This.Parent.Parent.DblClick() && for the Grid.DblClick()