Callbacks Lost after scripts compiled.

Hi , I lost All the callbacks in my custom editor Every time the scripts is compiled.

for example:
class MyEditor :EditorWindow
{
public System.Action myCallBack;

public static void ShowWindow(Action callBack)
{
myCallBack=callBack;
}
}

After I Changed My Code, "myCallBack" lost and I Need to close the editor and open it again...

Is there a solution for this issue?