Sender 转换TButtonItem TCategoryButtons

http://codeverge.com/embarcadero.cppbuilder.using/using-sender-to-determine-which/1068317

http://qc.embarcadero.com/wc/qcmain.aspx?d=70595

Using *Sender to determine which button triggered even

Sender 转换到TButtonItem

不能

TButtonItem *bi = static_cast<TButtonItem*>(Sender);

改用下面的方式

TCategoryPanel *CategoryPanel;

    for (int i = ; i < TreeView1->Items->Count; i++)
    {
        if (TreeView1->Items->Item[i]->Level == )
        {
            CategoryPanel = new TCategoryPanel(CategoryPanelGroup1);
            CategoryPanel->PanelGroup = CategoryPanelGroup1;
            CategoryPanel->Caption = TreeView1->Items->Item[i]->Text;
        }
        TCategoryButtons * CategoryButtons;
        CategoryButtons = new TCategoryButtons(CategoryPanel);
        CategoryButtons->Parent = CategoryPanel;
        CategoryButtons->Align = alTop;
        CategoryButtons->Height = TreeView1->Items->Item[i]->Count * (this->Canvas->TextHeight("a") + );
        CategoryButtons->ButtonOptions << boFullSize;
        CategoryPanel->Height = CategoryButtons->Height + ;

        TButtonCategory *ButtonCategory;
        ButtonCategory = new TButtonCategory(CategoryButtons->Categories);
        TButtonItem *bi;
        // CategoryButtons->Categories->Items[0]->Items  //TButtonCollection*

        if (TreeView1->Items->Item[i]->HasChildren)
        {
            for (int j = ; j < TreeView1->Items->Item[i]->Count; j++)
            {
                bi = new TButtonItem(CategoryButtons->Categories->Items[]->Items);
                bi->Caption = TreeView1->Items->Item[i]->Item[j]->Text;
            }
        }

    }
    CategoryPanelGroup1->CollapseAll();

void __fastcall TForm28::CategoryButtons1Categories0Items0Click(TObject *Sender)
{
 TCategoryButtons *cb = static_cast<TCategoryButtons*>(Sender);
 TButtonItem *bi = static_cast<TButtonItem*>(cb->SelectedItem);
 Caption = bi->Caption;
}

CategoryButtons.BorderStyle=bsNone

CategoryButtons.ButtonHeight=40

CategoryButtons.ButtonWidth=100