Try to apply RefreshPropertiesAttribute attribute to your property. This will trigger refreshing of the property grid when its value changes.

 Hi there,

 I've created an expandable "PropertyGrid" control that initially looks like this when fully expanded (you'll need a fixed-space font in your news-reader to see it properly aligned):

 -Name
   -Dimensions  10,20
        Width   10
        Length  20

 As soon as I type in a name for the "Name" property however and press <Enter>, the grid then looks like this:

 -Name          Whatever
   +Dimensions  10,20
        Width   10
        Length  20

 Notice the "+" that now appears beside the "Dimensions" property. The grid automatically closed the "Dimensions" property IOW (why?) but didn't clear out the "Width" and "Length" beneath it. It appears to be a cosmetic problem only since if I call "PropertyGrid.Refresh()" it does clear it. Does anyone know what's going on here. I don't see why it should close "Dimensions" in the first place but even if it does, why isn't it clearing out the "Width" and "Length" rows. Thanks.