Button with rounded corners

I have a button that changes colors depending on certain parameters. Actually, it is also being used as a label that displays different text depending on the state of certain things. Now, if I dont define the colors in the code, the button has rounded corners by default (radius 5, I think). But with the color definations, the button shape has sharp corners. This even happens if I change the button properties in the designer to staelist drawable', instead of defaultdrawable.

I have seen this thread http://www.b4x.com/forum/basic4android-updates-questions/6642-button-color-background.html but that doesnt really help.

Any idea how I can retain the color statements in the code, and yet have rounded corners?