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 );
}

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 );
}

To copy to clipboard, switch view to plain text mode 

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?