how to reference to other topcomponent

now i got a super simple solution, create a Global class:

public class Global {
	public static SymbolWindowTopComponent window;
}

then self register the window in the static variable:

Global.window = this;

finally in other window, i can:

Global.window.jLabel1.setText("peter");

BUT IS IT NORMAL? ANY HIDDEN DISADVANTAGE FOR THIS METHOD?

thanks
from Peter