Microsoft JScript runtime error: 'offsetWidth' is null or not an object

[Rajendra]

We added text box in grid header, so user can change the grid header name but when we press the mouse to seleting the grid header text box text and then move mouse to out side the text box.   it thow java script error - "Microsoft JScript runtime error: 'offsetWidth' is null or not an object"
We have underneath seeting for RadGrid : -
 <telerik:RadGrid ID="grdAllTelerik"
                            ShowFooter="true" Skin="Office2010Silver"
                            runat="server" AutoGenerateColumns="false" Width="100%" OnItemCreated="grdAll_RowCreated"
                            OnItemDataBound="grdAll_ItemDataBound" OnNeedDataSource="grdAllTelerik_NeedDataSource">
    <ClientSettings>
        <Resizing AllowResizeToFit="true" ResizeGridOnColumnResize="true" AllowColumnResize="true">
        </Resizing>                                
    </ClientSettings>                           
</telerik:RadGrid> 

if(this._owner._owner._isResize){return;
}var h=Telerik.Web.UI.Grid.GetCurrentElement(g);
var f=Telerik.Web.UI.Grid.GetFirstParentByTagName(h,"th");    ---->  f is null
var a=Telerik.Web.UI.Grid.FindPosX(h);
var c=!!this._owner._owner.ClientSettings.AllowDragToGroup&&this._data.Groupable;
var d=!!this._owner._owner.ClientSettings.AllowColumnsReorder&&this.get_reorderable();
if(c||d){this.get_element().title=this._owner._owner.ClientSettings.ClientMessages.DragToGroupOrReorder;
this.get_element().style.cursor="move";
}if(this._owner._owner.ClientSettings.Resizing.AllowColumnResize&&this.get_resizable()&&Telerik.Web.UI.Grid.GetEventPosX(g)>=(a+f.offsetWidth-5)&&!Telerik.Web.UI.Grid._moveHeaderDiv){this._canDragDrop=false;
}if(this._owner._owner.ClientSettings&&this._owner._owner.ClientSettings.Resizing.AllowColumnResize&&this.get_resizable()&&this.get_element().tagName.toLowerCase()=="th"){var h=Telerik.Web.UI.Grid.GetCurrentElement(g);
if(this._owner._owner.GridDataDiv&&!this._owner._owner.GridHeaderDiv&&!window.netscape){var b=0;

[Pavlina]

Hello Rajendra,

I am afraid that we can not determine what is causing this error based on the provided information. Can you paste the related code-behind, so we can test your scenario locally and try to replicate the issue you are facing. Otherwise it will be hard to help you in resolving this problem.

I am looking forward for your reply.

Kind regards,
Pavlina
the Telerik team