Hi,

In the sample presented by Microsoft for "DataGridView Custom Column"
that represents a MaskedTextBoxColumn, it seems it has a problem in
setting properties of maskTextBox using visual tools(Editing
DataGridview's columns visually), that it stores null values after
changing the properties and it does not keep the modifications.

Is there any way to correct it or not?

http://msdn2.microsoft.com/en-us/library/ms180996.aspx

Thanks in advance.
Regards
Sajjad