How to access the property of a child usercontrol form in c# or vb.net

Hello,

I have a windows form with a panel wich include a usercontrol form.
Now i have to run some code on the main (parent) form, that checks the value of a property on the child form(usercontrol in panel).

I have created a public readonly property on the usercontrol, but when i try to read this i can't get the value.

I also get the error message "Conversion from string "" to type 'Integer' is not valid." on line  If uc.rl1 = True.

Property on usercontrol:

 Public ReadOnly Property rl1() As Boolean
        Get
            Dim r As Integer
            r = CInt(Me.txtRowIndex.Text)
            If r > -1 Then
                Return DGTimeTable.Item(4, r).Value
            Else
                Return False
            End If
        End Get
      End Property

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Code on mainform that should read this property:

 Dim buffer As Byte()
            ReDim buffer(2)
            Dim uc As ucTestform = New ucTestform
            uc = Me.ucPanel.Controls.Find("ucTestform", False)(0)
          
            If uc.rl1 = True Then buffer(0) = buffer(0) Or 128 Else buffer(0) = buffer(0) And 127
         

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Thanks in advance.

Edward