把TabControl添加到设计器的时候，默认会添加两个TabPage，当继承TabControl自定义控件的时候，这两个默认的TabPage常常会制造一些麻烦，今天我来介绍一种方法来去掉这两个默认的TabPage：实际上思路比较简单，主要是通过ToolboxItem特性提供自定义的ToolboxItem类来修改工具箱中的控件的初始化工程，只需要继承ToolboxItem类，重写CreateComponentsCore方法就可以实现了：[ToolboxItem(typeof(DemoToolboxItem))]public class MyTabControl : TabControl{}

[Serializable] //ToolboxItem必须是可序列化的class DemoToolboxItem : ToolboxItem{// The add components dialog in VS looks for a public// ctor that takes a type.public DemoToolboxItem(Type toolType): base(toolType){}

// And you must provide this special constructor for serialization.// If you add additional data to MyToolboxItem that you// want to serialize, you may override Deserialize and// Serialize methods to add that data. DemoToolboxItem(SerializationInfo info, StreamingContext context){Deserialize(info, context);}

// This implementation sets the new control's Text and // AutoSize properties.protected override IComponent[] CreateComponentsCore(IDesignerHost host,IDictionary defaultValues){

IComponent[] comps = base.CreateComponentsCore(host, defaultValues);

MessageBox.Show(((MyTabControl)comps[0]).TabPages.Count.ToString());((MyTabControl)comps[0]).TabPages.RemoveAt(0);//去掉默认添加的TabPage((MyTabControl)comps[0]).TabPages.RemoveAt(0);return comps;}}当然，如果愿意的话，也可以自己在CreateComponentsCore中添加自定义的TabPage来使我们的TabControl更加的有实用价值！