尝试

Try

我之前尝试过这个，但它给了我一个编译错误：找不到方法或数据成员即使我可以在代码一侧的类对象窗口中看到该表单。

I had tried this before however it gave me a Compile Error: "Method or data member not found" even though I can see the form in the Class Objects window at the side of the code.

它是否与放置在制表符控件中的子表单有关系吗？

Does it matter it''s a subform placed in a tab control?