strange behaviour in grid view

[Sameh]

Hi,
I have strange behaviour in telerik gridview
it was working great in the 2010 Q3 version but when i upgraded the project to 2011 Q1 i faced the problem
the issue is:
I have a gridview with two columns one contains a checkbox and the other contains a label and in the OnRowLoaded event i wrote a code to disable the checkbox in some cases of the current row, and it was working correctly in the previous version and when i upgraded to the current version i noticed that the grid is first loading as expected but when i scroll the grid another checkbox is disabled (it seems that the event is fired again) and again in each scroll (up or down) another checkbox is disabled.
after a lot of trying i set the property EnableRowVirtualization=False then the grid is worked correctly but i became very slow.

[Maya]

Hi Sameh,

Generally, when the virtualization is turned on (as it is by default), the visual elements will be recycled and then reused again. Consequently, you may get the behavior you experience - that some CheckBox-es are checked/unchecked upon scrolling. However, this will be observed only if no property from your business object is exposed as a data binding. So, I would suggest you to expose a boolean property and bind it to your GridViewCheckBoxColumn by DataMemberBinding. If you want to enable/disable some of those check boxes, I would recommend you to use the IsReadOnlyBinding as illustrated in this article. 

Greetings,
Maya
the Telerik team