I have a fairly simple form that displays a list of records with one filter. There is a set of two radio buttons to change the filter. When you click on one of the buttons, the interactive change method does the following:

thisform.mstatus = iif(this.value = 1,"A","C")

There is an mstatus_assign method that fires when we change mstatus:
usual parameter
this.mstatus = m.newval
set filter to this.mstatus
thisform.grid1.refresh()

Seems simple, but everytime I do it, I get a message "Property mstatus is not found." Mstatus is defined as a public variable on the form. The variable this.mstatus has the correct value in it when I check prior to the grid refresh. The form and grid are both staight from the standard libraries, no new code in refresh or anything like that. What bonehead thing am I doing or overlooking???

P.S. I will gladly email this code with a sample table set if you'd like to see it; it's all very small. But it's driving me crazy....

TIA!