In the latest build of WebGrid, a new server side function has been added in order to set the paging page from the server side. The function is SetCurrentPageIndex.

You could try using this server side function in order to accomplish your goal.

From what I understand, you are trying to insert a new custom command in the WebTextEditor floating toolbar.

This custom tool command will hold a WebContextMenu with the XML data specified in your post.

Unfortunately, such scenario has not been supported by WebTextEditor. WebTextEditor only support a single submenu for each command. We already have a sample for such scenario in ToolBar_CustomToolBar.aspx WebTextEditor provided sample.

Our control callback is named FlyPostBack. During FlyPostBack, in order to set value you will need to use RenderControl function. Here is an example to set a value during postback for TextBox. Here is the snippet:

TextBox1.Text = "New Value;";
wgTest.ClientAction.RenderControl(TextBox1);

If the suggestion does not solve your issue, do you mind sending us a simple sample of the issue?

Other suggestion would be to hold the value you wish to process in the hidden field during AddRow server side event.

Here is the snippet to set the hidden field during AddRow server side event, in this example the field ID has been known, 5, and the hidden column will have the value "Custom-Val":

HiddenField1.Value = "5;Custom-Val";
wgTest.ClientAction.RenderControl(HiddenField1);

Here is the snippet to retrieve the hidden field during OnAfterAdd client side event:

<script language="javascript" type="text/javascript">
	function wgTest_OnAfterAdd(controlId, tblName, rowObject, xmlResponseObject)
	{
		setTimeout(function()
		{
		    var fieldVal = document.getElementById('HiddenField1').value;
		    var valComp = fieldVal.split(";");

		    alert(valComp[0] + " " + valComp[1]);
		    
		}, 10);
		
		return true;
	}
</script>

Declaration of the hidden field:

<asp:HiddenField ID="HiddenField1" runat="server" />

As a workaround, you will need to use a column name alias for such column in the SQL command in order for the table adapter generated parameter and WebGrid generated parameter to match.

Another suggestion, would be to convert the parameter to the expected value in the ISDS during deleting and editing server side event. Here is the snippet for the Deleting scenario.

ISDS Deleting server side event for # character:

protected void ISDataSource1_Deleting(object sender, ISNet.WebUI.DataSource.ISDataSourceMethodEventArgs e)
{
    e.InputParameters["_Original_Category_"] = e.InputParameters["Original_Category#"];
    e.InputParameters.Remove("Original_Category#");
}

ISDS Delete Parameter for # character:

<ISDataSource:ISDataSourceTable DeleteMethod="Delete" InsertMethod="Insert" 
    OldValuesParameterFormatString="Original_{0}" SelectMethod="GetData" 
    TableName="CategoriesPoundSign" 
    TypeName="CategoriesPoundSignTableAdapters.CategoriesPoundSignTableAdapter" 
    UpdateMethod="Update">
    <DeleteParameters>
        <asp:Parameter Name="_Original_Category_" Type="Int32" />
        <asp:Parameter Name="Original_Category#" Type="Int32" />
    </DeleteParameters>