How do I insert custom @ Register tags into the aspx file from my custom control

In the custom control’s custom designer’s Initialize override, do something like this: [C#] public override void Initialize(IComponent component) { base.Initialize (component); IDesignerHost host = component.Site.Container as IDesignerHost; IDesigner designer = host.GetDesigner(host.RootComponent); // Calling GetHTMLFromWebControlTool with the following custom toolboxitem will insert the // Register directives for the type associated with that . MethodInfo mi = designer.GetType.GetMethod(‘GetHTMLFromWebControlTool’, BindingFlags.NonPublic | BindingFlags.Instance); if(mi != null) { // DependantType is a custom type defined in DependantAssembly.dll mi.Invoke(designer, new object[]{new WebControlToolboxItem(typeof(SomeNamespace.DependantType))}); } } Then when the user drags and drops the item from the toolbox, besides the default @ register entry it makes, it will also make an entry like this: <%@ Register TagPrefix=’cc1′ Namespace=’SomeNamespace’ Assembly=’DependantAssembly, Version=2.0.0.1, Culture=neutral, PublicKeyToken=3d6dfsd1fdsd44c89′ %> The assembly will not be strong named in the above tag if it’s not in the GAC.