[Interest] Problem applying a graphical effect to a button control.

[rgomez at uci.cu]

Hi, am trying to apply a graphical effect to a button control. 

The first problem is that initially the effect is not shown, then when I click 
the button it show the effect covering the entire area of the button, indeed I 
have tried with DropShadow effect and the shadow covers the button.
Could any body tell me how to apply correctly a graphic effect to a qtquick 
control?
VII Escuela Internacional de Verano en la UCI del 30 de junio al 11 de julio de 2014. Ver www.uci.cu