DtvLong dal_but_pop_but (idb, idm)

Makes the passed button area in the linked mask visible.

Input Parameters Significance
DtvLong idb button area Id
DtvLong idm Id of the mask the button area is linked to [optional]

Output Parameters Significance
none -

Return Code Significance
0 all ok
-1 zero Id

The function automatically invoke any set Button listener function.