KCModule integrating

[lum]

Hello,
My program is to integrating some kcontrol modules into one own new kcontrol module, using KCModuleLoader.

MyKCModule::MyKCModule()
{
......
KCModule *kcm=KCModuleLoader::loadModule( name, page );
......
connect( kcm, SIGNAL( changed(bool) ), this, SLOT( moduleChanged(bool) ) );
......
}
......
void MyKCModule::moduleChanged( bool isChanged )
{
......
emit changed( true );
}
When running, however, the "Apply" "OK" "Default" buttons are misacting or invlidating.
For example, if you change some settings, the "Apply" button still is gray and has no funtion.
Why?