Start your form with something like:
DO FORM myform LINKED
Then when you need to change its properties you can:
IF TYPE('myform.caption')="C"
myform.closable=.F.
ENDIF
I know most look for the existence of the object, but I check for a character caption on the form myself since all of my forms have character expressions in their captions.
.·*´¨)
.·`TCH
(..·*
010000110101001101101000011000010111001001110000010011110111001001000010011101010111001101110100
"When the debate is lost, slander becomes the tool of the loser." - Socrates
Vita contingit, Vive cum eo. (Life Happens, Live With it.)
"Life is not measured by the number of breaths we take, but by the moments that take our breath away." -- author unknown
"De omnibus dubitandum"