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It appears that the listbox simply calls the To String() function when you add an item and uses that as it's display.

For my item, the To String() simply returns a private string called 'name'; Now if I change that name variable, the list box continues to show the previous name.

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To String() End If Next This is my error: Referencia a objeto no establecida como instancia de un returns all the selected values (for example if there are 10 items selected, it returned the 10 values) and after that it crashes. I'm using the following code to check and uncheck all the items according to a first item named "All": Private Sub clb Rubros_Item Check(By Val sender As System. Please modify my sample or provide yours where the current problem exists. Item Count, I was missing the "-1" so I was getting more Checked Items and the "For Eachs" crashes. Disclaimer: The information provided on Dev and its affiliated web properties is provided "as is" without warranty of any kind. Could you please assist us in recreating this shortcoming? In the (Un)Check All procedure, i was calling For i As Integer = 1 To clb Rubros. I have created a sample for you, and it appears to work fine on my side.Occurs when an owner-drawn List Box is created and the sizes of the list items are determined. This control presents a list of items that the user can navigate by using the keyboard or the scrollbar on the right side of the control.The user can place a check mark by one or more items and the checked items can be navigated with the Checked List Box Checked Index Collection. Get Item Checked(0) Then Check() Else Un Check() End If End If End Sub Private Sub Check() For i As Integer = 1 To clb Rubros. Set Item Checked(i, True) Next End Sub Private Sub Un Check() For i As Integer = 1 To clb Rubros. Set Item Checked(i, False) Next End Sub Hi Tatiana, My attempts to replicate the issue you are experiencing have been unsuccessful. Index If v Index = 0 Then ' This is the "All" item If clb Rubros.But it's kind of bad practice; you want to try to separate your implementation from your presentation. Please refer to the How to get the checked rows of a data-bound Checked List Box Control KB article, to learn how to accomplish this task. However, if I select all the items, it throws an error. Please refer to the Dev Website Terms of Use for more information.The Margin property tells the location of a List Box on the parent control.The Horizontal Alignment and Vertical Alignment properties are used to set horizontal and vertical alignments.

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