In the dbgrid with data load it usually has a strange behavior.After loading data, select the first line with the mouse and click the down arrow, several blank lines are created.Here's a view to simulate the problem.

Code:
Use cWebView.pkgUse cWebPanel.pkg
Use cWebForm.pkg 
Use cWebButton.pkg
Use cWebGrid.pkg
Use cWebColumn.pkg


Object oOGrid_manual is a cWebView
//    Set piWidth to 700
    Set psCaption to "OGrid_manual"


    // Your DDO structure will go here


    Object oWebMainPanel is a cWebPanel
        Set piColumnCount to 50


        Object oWebButton1 is a cWebButton
            Set piColumnSpan to 0
            Set psCaption to "Refresh"
        
            Procedure OnClick
                Send GridRefresh of oWebGrid1
            End_Procedure
        End_Object


        Object oWebGrid1 is a cWebGrid
//            Set pbFillHeight to True
            Set pbDataAware to False
            Set peDbGridType to gtManual
            Object oWebColumn0 is a cWebColumn
                Set psCaption to "Disable"
                Set piWidth to 50
                Set pbRender to False
            End_Object




            Object oWebColumn1 is a cWebColumn
                Set psCaption to "Disable"
                Set piWidth to 50
                Set pbEnabled to False
            End_Object
            Object oWebColumn2 is a cWebColumnCheckbox
                Set psCaption to "Enable"
                Set piWidth to 50
            End_Object
        
            Procedure OnManualLoadData tWebRow[] ByRef aTheRows String ByRef sCurrentRowID
                Forward Send OnManualLoadData (&aTheRows) (&sCurrentRowID)
                Integer qtde
                For qtde from 0 to 8
                        Move qtde to aTheRows[qtde].sRowID
                        Move qtde to aTheRows[qtde].aCells[0].sValue
                        Move qtde to aTheRows[qtde].aCells[1].sValue
                        Move 0    to aTheRows[qtde].aCells[2].sValue
                Loop
                
            End_Procedure
        End_Object
        
    End_Object 


End_Object
In the dbgrid with data load it usually has a strange behavior.After loading data, select the first line with the mouse and click the down arrow, several blank lines are created.Here's a view to simulate the problem.