Hi

                2010 Q2 SP2

                I have grid with 500 rows and enabled multiselection.

I select first row and start multiselection (SHIFT and arrow down buttons). During selecting rows between 1 and 7 or 8 everything is fine (rows are selected – notification by orange background).

When I cross row 7 or 8 my one CPU core jumps to 50% and there is no notification that next rows are selected.

I have to stop multiselection to see orange background for selected rows.

I tested this for bound and unbound mode.

Is there any way to improve performance of this simple functionality?

I am more interested about unbound mode because in ma case I have variable number of columns.

                Here you can read my  simple source code:

Regards

1. I placed RadMenu on my form.
2. I added 3  radMenuButtonItems 
3. Set Orientation property of the menu to :Vertical.
4. Set RootElement TextOrientation to :Vertical
5. Now my menu is upside down

Version 2010.3
In the GridView/self-referencing WinForms VB.NET demo sample,how to:
1.To get sum(Size) of "RadControls for Winforms", "RadControls for Silverlight", "RadControls for WPF" and "RadControls for ASP.NET AJAX", then write the Sum(Size) to Size cell of "Telerik RadControls".
2.To get sum(Size) of "bin" and "READEME.txt", then write the Sum(Size) to Size cell of "Visual Studio 2010".
3.To get sum(Size) of "Visual Studio 2010" and "Telerik RadControls" ,then write the Sum(Size) to Size cell of "Program Files".
4.And so on...
5.When any Size cell of a child changed,an event trigger and update it's parent /grantparent Size cell.

Best Regards.