The popup form is activated with

DO FORM LISTMANAGE

and the form's WindowType is 1-Modal. The messagebox is default code from foxpro:

cMessageTitle = 'DELETE CONFIRMATION!'
cMessageText =  'Are you sure you want to delete this selection?'
nDialogType = 4 + 32 + 256
*  4 = Yes and No buttons   32 = Question mark icon   256 = Second button is default
nAnswer = MESSAGEBOX(cMessageText, nDialogType, cMessageTitle)