Did you subclass DG? Alter its styles?
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Daniel Freiman Sent: Friday, October 19, 2007 2:37 PM To: flexcoders Subject: [flexcoders] DataGrid not initializing default styles I'm getting a situation where a Datagrid is not initializing it's default styles and is causing runtime errors when datagrid functions try to retrieve and operate on styles that are null. I'm getting two errors which I'm hoping will look familiar to someone: The first one occurs when the PopUpManager is validating a new popup container of which the datagrid is a descendant: TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.controls::DataGrid/mx.controls:DataGrid::drawHeaderBackground()[C:\de v\flex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:2573] at mx.controls::DataGrid/mx.controls:DataGrid::updateDisplayList()[C:\dev\f lex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:1257] at mx.core::UIComponent/validateDisplayList()[C:\dev\flex_201_gmc\sdk\frame works\mx\core\UIComponent.as:5760] at mx.managers::LayoutManager/validateClient()[C:\dev\flex_201_gmc\sdk\fram eworks\mx\managers\LayoutManager.as:858] at mx.core::UIComponent/validateNow()[C:\dev\flex_201_gmc\sdk\frameworks\mx \core\UIComponent.as:5218] at mx.managers::PopUpManagerImpl/centerPopUp()[C:\dev\flex_201_gmc\sdk\fram eworks\mx\managers\PopUpManagerImpl.as:336] at mx.managers::PopUpManager$/centerPopUp()[C:\dev\flex_201_gmc\sdk\framewo rks\mx\managers\PopUpManager.as:163] at com.colorquick.improv.managers::PaneManager$/openPane()[C:\Documents and Settings\Daniel\My Documents\Flex Builder 2\Improv2\com\colorquick\improv\managers\PaneManager.as:98] at com.colorquick.improv.toolbars.controls::DAMBrowseLists/com.colorquick.i mprov.toolbars.controls:DAMBrowseLists::clickHandler()[C:\Documents and Settings\Daniel\My Documents\Flex Builder 2\Improv2\com\colorquick\improv\toolbars\controls\DAMBrowseLists.as:24] If I workaround this error, the second one gets thrown after the dataprovider and columns properties are updated: TypeError: Error #1007: Instantiation attempted on a non-constructor. at mx.controls::DataGrid/mx.controls:DataGrid::drawSeparators ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:2896] at mx.controls::DataGrid/mx.controls:DataGrid::updateDisplayList()[C:\dev\f lex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:1269] at mx.core::ScrollControlBase/mx.core:ScrollControlBase::setScrollBarProper ties ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\core\ScrollControlBase.as:1084] at mx.controls::DataGrid/mx.controls:DataGrid::configureScrollBars()[C:\dev \flex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:1791] at mx.controls.listClasses::ListBase/mx.controls.listClasses:ListBase::upda teDisplayList()[C:\dev\flex_201_gmc\sdk\frameworks\mx\controls\listClass es\ListBase.as:2972] at mx.controls::DataGrid/mx.controls:DataGrid::updateDisplayList ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\controls\DataGrid.as:1208] at mx.core::UIComponent/validateDisplayList()[C:\dev\flex_201_gmc\sdk\frame works\mx\core\UIComponent.as:5760] at mx.managers::LayoutManager/mx.managers:LayoutManager::validateDisplayLis t ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\managers\LayoutManager.as:600] at mx.managers::LayoutManager/mx.managers:LayoutManager::doPhasedInstantiat ion()[C:\dev\flex_201_gmc\sdk\frameworks\mx\managers\LayoutManager.as:67 3] at Function/http://adobe.com/AS3/2006/builtin::apply() at mx.core::UIComponent/mx.core:UIComponent::callLaterDispatcher2()[C:\dev\ flex_201_gmc\sdk\frameworks\mx\core\UIComponent.as:7909] at mx.core::UIComponent/mx.core:UIComponent::callLaterDispatcher ()[C:\dev\flex_201_gmc\sdk\frameworks\mx\core\UIComponent.as:7852] - Dan Freiman
