how to add text dynamically in Tree view list box

CS3/WIN<br />hi,<br />I am new in plugin development.<br />I have a Tree View List box on a dialog.<br />b I don't want to display text when i load the plugin.<br />b I want to insert text data when i click on "Insert" button on dialog. <br />I have defined Adapter,Mgr,Observer for list box.it is working fine when i want to display data at loading time itself.but not when i click on insert button.<br />b In dialog observer i have defined this but it is not working<br /><br />b Dialog Observer::Update<br /><br />InterfacePtr<IPanelControlData> panelControlData(this, UseDefaultIID());<br />IControlView* Grid = panelControlData->FindWidget(kESSGridTVWidgetID);<br />InterfacePtr<IStringListControlData> listControlData(Grid,UseDefaultIID());<br />if (theSelectedWidget == kESSInsertButtonWidgetID && theChange == kTrueStateMessage) <br />{<br />listControlData->AddString(strText,kESSListBoxTextWidgetID); <br />}<br /><br />b it is showing error <br />b operator new returning nil for an allocation size of 486022320 bytes<br />(..\..\..\source\components\memoryallocator\PMNew.cpp (552))<br />b Memory allocation failure<br />(c:\development\cobalt\source\public\includes\K2Allocator.h (131))<br />can any one help to get this..<br />Thanks.