关于引用变量储存字符串的问题

VB6.0
dim a as string
a="Form"
怎样引用变量a代替字符串Form,实现如下功能
Form.height=640
[110 byte] By [jonnysp] at [2008-1-9]
# 1
补充下,能不能使用转义字符实现?
jonnysp at 2007-10-18 > top of Msdn China Tech,visual basic,基础类...
# 2
Private Sub Command1_Click()
Dim a As String
Dim f As Form

a = "form2"

Set f = Forms.Add(a)

f.BackColor = vbRed
f.Height = 640
f.Show
End Sub