mdi

This question already has answers here : Closed 6 years ago . Possible Duplicate: Cross-thread operation not valid I am trying to close the base of a form from another thread. I am getting the following error. System.InvalidOperationException: Cross-thread operation not valid: Control 'MDIParent' accessed from a thread other than the thread it was created on. for the below line: MDIParent.MDIParentRef.BaseClose(); You need to perform the operation on the UI Thread: if (InvokeRequired) Invoke(new Action(MDIParent.MDIParentRef.BaseClose)); else MDIParent.MDIParentRef.BaseClose(); 来源： https:/

I have an MDI application (written in .NET 2.0) which lets users open multiple child forms. The child forms are always maximized inside the MDI parent. When the MDI parent is maximized and I attempt to do a MessageBox.Show, the MessageBox doesn't show. If I do an alt-tab (or even just press alt) the MessageBox pops to the front. Any ideas how to make that sucker show up to begin with? This is only a problem when the MDI parent is maximized... Try using MessageBox.Show(Window owner, string message, string caption) Setting the MDI application as owner so the MB is shown in the front Ah, you

I'm trying follow what was suggested in this answer, changing this part of Vcl.Forms.pas : procedure TCustomForm.CreateWindowHandle(const Params: TCreateParams); var CreateStruct: TMDICreateStruct; NewParams: TCreateParams; begin if (FormStyle = fsMDIChild) and not (csDesigning in ComponentState) then begin {if (Application.MainForm = nil) or (Application.MainForm.ClientHandle = 0) then raise EInvalidOperation.Create(SNoMDIForm);} with CreateStruct do begin szClass := Params.WinClassName; szTitle := Params.Caption; hOwner := THandle(HInstance); X := Params.X; Y := Params.Y; cX := Params.Width;

i want to add some frame to my main frame, lets say we've 3 frames (Frame1, Frame2, and Frame3) i want to: Create new Frame called Frame 4 and add menu bar with items (View Frame1, View Frame2, View Frame3) --> actually i've created this frame successfully. When click on View Frame1 i want to display Frame1 in a certain place in Frame4 and so on for all menuItems My problem is i've created my old frames by using Drag-and-drop tech. in net beans There is a component called internalFrame but when i tried to use it i couldn't add my old frame to this internal one. You can solve your problems by

This question already has an answer here: Controls in container form come over child form? 8 answers I have a MDI form with many controls inside it like button,images,label,dropdown etc.I have made the form property isMDIContainer=true.When i click on a button inside the form another form is to be opened inside the parent.Now its opening,but unfortunately its opening behind all the controls.How to make the child form open infront of all the controls of main form? Form2 childForm = new Form2(); childForm.MdiParent = this; childForm.Activate(); childForm.Show(); Normally we don't add any child

I'm working on a project that uses an MDI application with a navigation panel on the side. Currently it is a ListView. However, I would like to redesign it to be similar to the toolbox in visual studio 2008. If this is something that would require overriding the default paint method, it would also help if you could provide some good references on how to work with the paint method as I do not currently have any experience using it. Thanks in advance. You want to be using a ToolBox control. A few freely available ones are available the most friendly that i've used being by Gordon Robinson at: