Cannot Access A Disposed Object

[MechMachineMan]

I have created a form in visual studio which I plan to implement in a rule to make things look nicer.

However, when I x out of the Form, and then try to run the rule again, it gives me an error about it being disposed.

Cannot access a disposed object.
Object name: 'SectionSymToolBox'.

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'SectionSymToolBox'.
 at System.Windows.Forms.Control.CreateHandle()
 at System.Windows.Forms.Form.CreateHandle()
 at System.Windows.Forms.Control.get_Handle()
 at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
 at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
 at SectionSymRule.LmiRuleScript.Main()
 at Autodesk.iLogic.Exec.AppDomExec.ExecRuleInAssembly(Assembly assem)
 at iLogic.RuleEvalContainer.ExecRuleEval(String execRule)

How do i fix this?

Rule: 

AddReference "C:\Users\Documents\Visual Studio 2013\Projects\WindowsApplication1\WindowsApplication1\bin\Release\SectionSymToolBox.dll" 

Public Class SectionSymRule

	Public Shared ToolBox As New SectionSymToolBox.SectionSymToolBox

	Sub Main()
		AddHandler ToolBox.Button1.Click, AddressOf SwapSymbols
		AddHandler ToolBox.Button2.Click, AddressOf SwapSymbols
		AddHandler ToolBox.Button3.Click, AddressOf SwapSymbols
		AddHandler ToolBox.Button4.Click, AddressOf SwapSymbols
		AddHandler ToolBox.Button5.Click, AddressOf SwapSymbols
	

	
	ToolBox.Show()
	
	End Sub
	
	Sub SwapSymbols()
		MsgBox("Here!")
	End Sub

End Class