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Loop each grid row and get control
Hide Grid inside Main Grids Edit Template
Hide the grid on control click
Hide the grid initially
DevExpress ASPxGridView

Loop each grid row and get control[-][--][++]

In this example, the GridView has 4 columns, a column with a checkbox, and 3 columns of data. I want to loop \through all grid columns and get which checkboxes are selected. (Note the same column with the checkbox also \has a hiddel ASPxLabel called lblID that holds the OPC_ID of the database row to be deleted). And in the \GetCurrentPageRowValues("Confirm"), confirm is the header name (not caption, but name=) of a column in the grid (column display \headers are 'Confirm,Op Code,Oldest History, RO Count')
Exclamation3
Note, the bind of this gv must be in Page_Load. When you click btnConfirm, Page_Load will bind gv again, but keep checkbox values, then btnConfirm will be called.
    Protected Sub btnConfirm_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnConfirm.Click
        Dim i As Int16 = 0
        Dim chk As DevExpress.Web.ASPxEditors.ASPxCheckBox
        Dim lblID As DevExpress.Web.ASPxEditors.ASPxLabel
        For i = 0 To grdConfirm.GetCurrentPageRowValues("Confirm").Count - 1
            chk = grdConfirm.FindRowCellTemplateControl(i, grdConfirm.Columns(0), "chkDelete")
            If chk.Checked Then
                lblID = grdConfirm.FindRowCellTemplateControl(i, grdConfirm.Columns(0), "lblID")
                'lblError.Text &= lblID.Text.ToString & ","
                DAL.OpcHistory.DelSelection(Val(ddlCategory.Value.ToString), Me.DLR_ID, lblID.Text)
            End If
        Next
        pnlConfirm.Visible = False
        pnlOptions.Visible = True
        txtFilter.Text = ""
        Me.FillListBoxes()
    End Sub

Hide Grid inside Main Grids Edit Template[-][--][++]

Hide the grid on control click[-][--][++]

I have 2 grids, one is inside the others edit template, I want to hide the second grid with a client side click.Note, the ASPxRadioButton, or all ASPx controls don't have a standard onclick, so I surrounded it with a divThis is just a nice example of finding the element id of a burried grid with javascriptsomecode.aspx 
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').style.display='none';">

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Hide the grid initially[-][--][++]

This is a beauty, when they click edit on the master grid, I want the second grid to be clientside display:none or block \depending on a value in the master grids database column.So if the database column value is > 0 then I should display the second grid. So I wrote a codebehind vb function 
    Public Function test(ByVal value As Integer) As String
        If value > 0 Then Return "block" Else Return "none"

    End Function
Then in the .aspx page, I set a variable style parameter 

Select the Custom Page Permission for this group

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So the Eval("Limit") sets the radLimit radio button above, so it radLimit is checked (So Eval(Limit) > 0) then \show the grid initially, else hide it. Nice!You can even skip the codebehind function creation and simply use the build in function IIF, this is a better solution.