This article discusses customizing Ria OLAP control's toolbox. Read the article on the HTML OLAP Grid toolbox customization here.

You can add your own buttons, specifying their appearance, tooltip, the way of handling the pressing event, including callback, postback and client script.

Overriding the on-click actions of the standard toolbox buttons

For overriding the standard on-click actions you should handle the ToolboxItemAction event.
The handler of this event is called right before performing the standard action. The parameter of the ToolboxItemActionArgs type, passed to the event, contains all the information for processing the user's action.
In the event handler, you can define what button is pressed by examining the e.Item property, and prevent fulfilling of the standard action by setting the e.Handled flag to True.

For example, let's override the standard on-click action of the Save button. The default on-click action is saving the current state of the Grid and sending it to the user in a XML file. We'll make it save the current Grid state to the database:

protected void TOLAPGrid1_ToolboxItemAction(object sender, GridToolboxItemActionArgs e)
{
    if (e.Item is RSaveLayoutToolboxButton)
    {
        string xmlstring = TOLAPGrid1.Serializer.XMLString; // save the string to the database 
        e.Handled = true;
    }
}

Adding new buttons to the Toolbox

To add a button to the Toolbox you just need to put an appropriate object to the Buttons.CustomButtons collection. You can do it either programmatically (in the Page_Init event handler, not later!) or in DesignTime.
When you create a user button instance programmatically, mind that the ButtonID property value should be unique for each button and remain unchanged from session to session. In general, each of the user’s buttons, added to the Toolbox, should have a unique value of the ButtonID property, by which it can be identified in ToolboxItemAction event handler.
In addition to the ButtonID and such self-explanatory properties as Image and Tooltip, each button has a very important HandlingType property that defines the way of processing the action of pressing the button. There are three possible ways to process the pressing of a Toolbox button:

• Postback-processing on the server
• Callback-processing on the server
• Firing a client script

protected void TOLAPGrid1_Init(object sender, EventArgs e)
{
    //Create the custom button that calls the client script
    RCustomToolboxButton item = new RCustomToolboxButton();
    item.ButtonID = "13460583-0ae4-4ec3-8d2f-2cbf914928a0";
    item.ButtonType = TToolButtonType.Button;
    item.ClientScript = "alert('Hello!')";
    item.Tooltip = "Custom button (calls the client script)";
    item.Visible = true;
    item.Image = "~/Images/scriptBtn.png";
    item.HandlingType = TClientActionHandlingType.ClientOnly;
    TOLAPGrid1.Buttons.fToolItems.Add(item.ButtonID, item);

    //Create the custom button that sends the callback on the server
    item = new RCustomToolboxButton();
    item.ButtonID = "50257885-2cca-4290-86e0-618a57bf62a0";
    item.ButtonType = TToolButtonType.Button;
    item.Tooltip = "Custom button (PostBack)";
    item.Visible = true;
    item.Image = "~/Images/postbackBtn.png";
    item.HandlingType = TClientActionHandlingType.Postback;
    TOLAPGrid1.Buttons.fToolItems.Add(item.ButtonID, item);

    //Create the custom button that sends yhe postback on the server
    item = new RCustomToolboxButton();
    item.ButtonID = "c9fb43c6-6c59-40d5-8255-eaee767c0b21";
    item.ButtonType = TToolButtonType.Button;
    item.Tooltip = "Custom button (CallBack)";
    item.Visible = true;
    item.Image = "~/Images/callbackBtn.png";
    item.HandlingType = TClientActionHandlingType.Callback;
    TOLAPGrid1.Buttons.fToolItems.Add(item.ButtonID, item);
}

For processing the pressing of the button, you need to write a ToolboxItemAction event handler:

protected void TOLAPGrid1_ToolboxItemAction(object sender, GridToolboxItemActionArgs e)
{
if ((e.Item is RCustomToolboxButton) && (e.Item.ButtonID == "50257885-2cca-4290-86e0-618a57bf62a0"))    
        {        
            // do some action    
        }
}