move controls fluently at runtime

Question

how can I do that?

I want to move a panel out of my window.
I tried it with a timer and the following

groupBoxMenge.Location = new Point(groupBoxMenge.Location.X, groupBoxMenge.Location.Y + 10);

that works but it isn't fluently. Actually it looks really awful... it is flickering..

Can anybody help me?

thx a lot