C++ Builder - Using same Event TWICE

Question

I have a problem and I don't understand where I'm going wrong. My program doesn't show any compiler errors.

I am working at a chess project. When I click on a piece, I want an ID to be remembered. When I click on the Board, I want to move the piece with that ID. I have 2 black ROOKS, both with different IDs.

Here is the code:

formaJoc.cpp

void movePiece(int piece, int col, int row)
{
    int left = rowColToPixel[col];
    int top  = rowColToPixel[row];
    switch (piece)
    {
        case(0): {
            fJoc->BlackRooks1[1]->imPiece->OnMouseDown = fJoc -> bkRook1MouseDown;
            fJoc->BlackRooks1[1]->imPiece->Left=left;
            fJoc->BlackRooks1[1]->imPiece->Top=top;
            break;
        }
        case(1): {
            fJoc->BlackRooks2[1]->imPiece->OnMouseDown = fJoc -> bkRook2MouseDown;
            fJoc->BlackRooks2[1]->imPiece->Left=left;
            fJoc->BlackRooks2[1]->imPiece->Top=top;
            break;
        }
    }
}

void __fastcall TfJoc::bkRook1MouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y)
{
    id = 0;
}

void __fastcall TfJoc::bkRook2MouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y)
{
    id = 1;
}

void __fastcall TfJoc::imBoardMouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y)
{
    if (id != 99) {
        col = (X - 40) / 36;
        row = (Y - 40) / 36;
        //movePiece(id, col, row);
        //id=99;
        ShowMessage(id);
    }
}

formaJoc.h

bkRook*   BlackRooks1[1];
bkRook*   BlackRooks2[1];

void __fastcall TfJoc::bkRook1MouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y);
void __fastcall TfJoc::bkRook2MouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y);

void __fastcall imBoardMouseDown(TObject *Sender,
    TMouseButton Button, TShiftState Shift, int X, int Y);

When I run the program and click on ROOK 1, ID is set to 0. When I click on ROOK 2, ID is still 0. Why is it not 1? Why does it take the same ID?