1、效果预览

2、关键代码

void __fastcall TForm1::FormCreate(TObject *Sender)
{StringGrid1->ColCount = 4;StringGrid1->RowCount = 6;StringGrid1->DefaultRowHeight = ComboBox1->Height;StringGrid1->RowHeights[0] = 18;StringGrid1->ColWidths[2] = 80;StringGrid1->Cells[0][0] = "FirstName";StringGrid1->Cells[1][0] = "LastName";StringGrid1->Cells[2][0] = "SBVLEdit LV1";StringGrid1->Cells[3][0] = "Action";ComboBox1->Text = "";ComboBox1->Items->Add("Teen");ComboBox1->Items->Add("Adult");ComboBox1->Items->Add("Senior");ComboBox1->Visible = False;}
//---------------------------------------------------------------------------void __fastcall TForm1::ComboBox1Change(TObject *Sender)
{StringGrid1->Cells[StringGrid1->Col][StringGrid1->Row] = ComboBox1->Items->Strings[ComboBox1->ItemIndex];
}
//---------------------------------------------------------------------------
void __fastcall TForm1::StringGrid1DblClick(TObject *Sender) //双击事件
{TRect r;if(StringGrid1->Col == 2){int ACol = StringGrid1->Col;int ARow = StringGrid1->Row;r = StringGrid1->CellRect(ACol,ARow);ComboBox1->Top = StringGrid1->Top + r.Top + StringGrid1->GridLineWidth + 1;ComboBox1->Left = StringGrid1->Left + r.Left + StringGrid1->GridLineWidth +1;ComboBox1->Width = r.Right - r.Left;ComboBox1->ItemIndex = ComboBox1->Items->IndexOf(StringGrid1->Cells[ACol][ARow]);ComboBox1->Visible = true;}elseComboBox1->Visible = false;
}
//---------------------------------------------------------------------------

参考：http://ymg97526.blog.163.com/blog/static/17365816020135264552765/