Draw Colored Rectangle

Hi. I'm developing a backgammon game using xamarin forms. I use absolutelayout and each piece is a ContentView that I add to the absolutelayout. When a user clicks on a piece, I wanna be able to do 2 things :
1- draw a border or a colored circle around that piece.
2- draw a colored rectangle on the absolutelayout (the destination the peice can go to).
I tried using Frame and outlinecolor property instead of ContentView but the border it creates is too thin.
what should I do?