If you have a main WebToolBar in a page and an IFrame that has its own WebToolBar,
                you can merge both WebToolBar.
            
                This topic will show you how to merge WebToolBar.
            
                To configure ToolBar Merging
            
                - Create a parent page, for example : ParentWindow.aspx.
- In ParentWindow.aspx, drag PlaceHolderManager from ToolBox into
                    WebForm.
- Drag WebToolBar from ToolBox into the PlaceHolderManager. Set the
                    ID property to WebToolBar1.
- In Commands property, add ToolCommand Collection in 
                    ToolCommand Collection Editor. Click 
                        here for further information on how to define a ToolCommand. Add
                    three Button ToolCommand (New, Open, Save) in ToolCommand Collection Editor. Set
                    the sequence of the ToolCommands like the screenshots below.
 
  
 
 
 
- In Properties window, set DockingArea property to Top.
- Create another page, for example : childWindow.aspx.
- In childWindow.aspx, drag WebToolBar from ToolBox into WebForm. Set the 
                    ID of the WebToolBar as WebToolBarChild1.
- In Commands property, add ToolCommand Collection in ToolCommand Collection Editor.
                    Add two Button ToolCommand (Help, LicenseAgreement).
 
   
 
 
- In Properties window, set the MergeToolBar property to 
                    True.
- Go back to ParentWindow.aspx, add an IFrame and set the source
                    property to childWindow.aspx.
 
 <iframe src="childWindow.aspx" style="display: none;"></iframe>
 
 
- Right click on PlaceHolderManager control and choose Properties.
- Set EnableMergeBar to True.
- Run the project. The WebToolBar from another page (ChildWindow.aspx)is merged and
                    added into the PlaceHolderManager in this Page.
 
 