以下是解决方法： 
1.直接新建一个类，继承TabControl，然后 override DisplayRectangle 方法： 
复制代码代码如下:
/// <summary> 
/// 解决系统TabControl多余边距问题 
/// </summary> 
public class FullTabControl : TabControl { 

public override Rectangle DisplayRectangle { 
get { 
Rectangle rect = base.DisplayRectangle; 
return new Rectangle(rect.Left - 4, rect.Top - 4, rect.Width + 8, rect.Height + 7); 
} 
} 
} 
以后用 FullTabControl 就行。（这种方法简单） 


2.参见以下网址（VB.NET）代码： 

http://www.blueshop.com.tw/board/FUM20050124191756KKC/BRD201112281018075B8.html 

C# 代码为： 

复制代码代码如下:
public class FullTabControl : NativeWindow { 
static int TCM_FIRST = 0x1300; 
static int TCM_ADJUSTRECT = (TCM_FIRST + 40); 
struct RECT{ 
public int Left, Top, Right, Bottom; 
} 

protected override void WndProc(ref Message m) { 
if (m.Msg == TCM_ADJUSTRECT) { 
RECT rc = (RECT)m.GetLParam(typeof(RECT)); 
rc.Left -= 4; 
rc.Right += 3; 
rc.Top -= 4; 
rc.Bottom += 3;