can't save xml config

[AnthonyWang]

could anyone tell me in textinput plugin which function is for save xml config?
is public function plgVmOnStoreInstallPluginTable?or?
i can't figure out it

[GJC Web Design]

to save the config?

function plgVmDeclarePluginParamsCustomVM3(&$data){

      return $this->declarePluginParams('custom', $data);
   }

[AnthonyWang]

Thanks GJC!

[Milbo]

Actually it just declares the params. Storing happens automatically