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！
