Install Widgets for your Sitefinity Module during Module Installation

ModuleInstall.cs

public override void Install(SiteInitializer initializer)
{
	#region Install Toolbox Widgets

	// get section from toolbox
	var config = initializer.Context.GetConfig<ToolboxesConfig>();
	var pageControls = config.Toolboxes["PageControls"];
	var section = pageControls
		.Sections
		.Where<ToolboxSection>(e => e.Name == ToolboxesConfig.ContentToolboxSectionName) // Or other section eg: "NavigationControlsSection"
		.FirstOrDefault();

	// add widget to section if it doesn't exist
	if (!section.Tools.Any<ToolboxItem>(e => e.Name == "MY_CONTROL_NAME"))
	{
		var tool = new ToolboxItem(section.Tools)
		{
			Name = "MY_CONTROL_NAME",
			Title = "Title of Control",
			Description = "Description of control",
			ControlType = "~/Virtual/Path/To/Control.ascx",
			ModuleName = "Module_Name_Optional",
			CssClass = "CSS-class-optional"
		};
		section.Tools.Add(tool);
	}
}

Because this is executed during the module installation, you don't need to call SaveChanges(). The SiteInitializer will do this automatically if the module is successfully installed (or rollback all changes if it fails). For more, visit http://www.selarom.net/sitefinityguru