Collapse group columns on second level grouping

[Elena]

Hello,
i have radgrid with grouping on two levels, here is the aspx code:
...
<GroupByExpressions>
                                <telerik:GridGroupByExpression>
                                    <SelectFields>
                                        <telerik:GridGroupByField FieldAlias="Proces" FieldName="Proces" HeaderText="<%$ Resources:StartRes, Lb_Proces %>">
                                        </telerik:GridGroupByField>
                                    </SelectFields>
                                    <GroupByFields>
                                        <telerik:GridGroupByField FieldName="Proces" SortOrder="Descending"></telerik:GridGroupByField>
                                    </GroupByFields>
                                </telerik:GridGroupByExpression>
                            </GroupByExpressions>
                            <GroupByExpressions>
                                <telerik:GridGroupByExpression>
                                    <SelectFields>
                                        <telerik:GridGroupByField FieldAlias="Postapka" FieldName="Postapka" HeaderText="<%$ Resources:StartRes, Lb_Predmet %>">
                                        </telerik:GridGroupByField>
                                        <telerik:GridGroupByField FieldAlias="BrPRedmet" FieldName="BrPRedmet" HeaderText="<%$ Resources:StartRes, BrPRedmet %>">
                                        </telerik:GridGroupByField>
                                        <telerik:GridGroupByField FieldAlias="DelSubjekt" FieldName="DelSubjekt" HeaderText="<%$ Resources:StartRes, Tv_DSubjekti %>">
                                        </telerik:GridGroupByField>
                                    </SelectFields>
                                    <GroupByFields>
                                        <telerik:GridGroupByField FieldName="BrPRedmet"  SortOrder="Descending"></telerik:GridGroupByField>
                                    </GroupByFields>
                                </telerik:GridGroupByExpression>
                            </GroupByExpressions>
...
On Page load i need all group columns to be collapsed, on the first and on the second level. In the code behind i have code to collapse the group columns on the first level. The problem is that i can't access the group columns on the second grouping level. With debugging i found that RadGrid1.MasterTableView.Controls[0].Controls[1].Controls are the  group columns on the second level, but i don't know how to cast them so i can set Expand attribute to false. Here is the code that i use to collapse group columns on first level: 
 
foreach (GridItem item in RadGrid1.MasterTableView.Controls[0].Controls)
                {
                    item.Expanded = false;
}
If i try to access group columns on the second level with GridItem cast 

foreach (GridItem item in RadGrid1.MasterTableView.Controls[0].Controls)
                {
                    item.Expanded = false;
                    foreach (GridItem subitem in item.Controls[1].Controls)
                    {
                        
                    }
                }
 i get the message 

Unable to cast object of type 'Telerik.Web.UI.GridTableHeaderCell' to type 'Telerik.Web.UI.GridItem'.

Please help me how to cast the group columns on the second level so i can collapse them all on Page Load, or tell me some other solution for collapsing group columns. 

Thank you and pardon my English, not that good.

[Princy]

Hello Elena,

You can easily achieve this by setting the property GroupsDefaultExpanded as false. The groups will be expanded on grid load which is true by default).

aspx:

<MasterTableView DataKeyNames="EmpId" GroupsDefaultExpanded="false">
</MasterTableView>

Thanks,
Princy.

[Elena]

Hello,

thank you for the solution. Now i realize that my problem is not in the collapsing of the group columns on the second level on Page load, but in the expanding all the sub group columns when i expand a group column on the first level. 
Is there a way to prevent expanding on second level, when user expands group column on first level.

Thank you,
Elena.

[Pavlina]

Hi Elena,

Go through the link below:
http://www.telerik.com/community/forums/aspnet-ajax/grid/rad-grid-grouping-default-collapsed.aspx

Regards,
Pavlina
the Telerik team

[Elena]

Hello,

thank you for the link. The solution was very simple: 
 <MasterTableView AutoGenerateColumns="False" DataKeyNames="ID" PageSize="250" GroupLoadMode="Server"
                                GroupsDefaultExpanded="false">
It is important  GroupsDefaultExpanded to be set False and  GroupLoadMode to be on the Server side.

Elena.