让TreeView带上CheckBox

详细方法：http://www.ccrun.com/doc/go.asp?id=562

1，让TreeView1带上CheckBox：
SetWindowLong(TreeView1->Handle, GWL_STYLE, GetWindowLong(TreeView1->Handle, GWL_STYLE) | TVS_CHECKBOXES);

2，获得节点Node是否被选中：
bool Checked = TreeView_GetCheckState(TreeView1->Handle, Node->ItemId);

3，设置节点Node的选中状态：
bool Checked = true;
TreeView_SetCheckState(TreeView1->Handle, Node->ItemId, Checked);

4，设置节点Node及其子节点的选中状态（使用递归函数）：
void SetChildChecked(TTreeView *TreeView, TTreeNode *Node, bool Checked)
{????
??? TreeView_SetCheckState(TreeView->Handle, Node->ItemId, Checked);
??? for (int i=0; iCount; i++)
??????? SetChildChecked(TreeView, Node->Item[i], Checked);
}