Sharepoint 2010 Ribbon: Enrich custom dialogs

Standard dialogs in SharePoint 2010 come with ribbon component. In order to enrich your custom dialog with ribbon follow these steps.

1. Define CustomAction element in a declarative XML. I recommend to put this in a feature as described here MSDN: CustomAction Element

Note: Do NOT use dots in CustomAction Id, otherwise all buttons with associated actions will be disabled.

2. Register Ribbon on a page. I made it programmatically by the following code in the PreRender event handler.

protected void Page_PreRender(object sender, EventArgs e)
{
    SPRibbon current = SPRibbon.GetCurrent(this);

    if (current != null)
    {
        current.MakeTabAvailable("Ribbon.ClassifyDialog.Edit");
        current.InitialTabId = "Ribbon.ClassifyDialog.Edit";
        current.CommandUIVisible = true;
        current.Minimized = false;
    }
} 

3. Register javascript component containing client side logic on a page using SP.Ribbon.PageManager.get_instance().addPageComponent()
Link with method description is here MSDN: addPageComponent.

This is it. Enjoy professional look'n'feel of your dialogs.