How can I disable (grey out) specific tabpage(s) of a tab control programatically in my C# form app? - c#

I can't believe that disabling specific tabpages (visible but greyed out that means not clickable) is not possible in Visual Studio C# Form app. I have found just a workaround that I couldn't bring to work.(See link below)
I wanted to ask this question again, because perhaps there is another solution/workaround in the meantime.
How to highlight/grey-out Tabcontrol Tabpage
For just making the tab nonclickable (what is also OK for me) I have used this code, but not working
private void tabControl1_Selecting(object sender,TabControlCancelEventArgs e)
if (!e.TabPage.Enabled)
e.Cancel = true;

For example if you want to disable tabPage2 use this code in form load event. It will not show in intellisense but you can type.
tabPage2.Enabled = false;
Then use tab control selecting event like this
private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
if (e.TabPageIndex < 0) return;
e.Cancel = !e.TabPage.Enabled;


How to hide control when click outside it?

I have a WindowForm and some controls on it.
My point is that when I click button "?" on top-right of the datagridview, it will show a picture box and when I click outside the pictureBox, it must invisible.
My MainForm
I have searched some topics on this site, but some dont work, some work partly. Like
I also tried:
void pictureBox1_LostFocus(object sender, EventArgs e)
if (pictureBox1.Visible)
pictureBox1.Visible = false;
But when I click on button2, button3, ... The pictureBox wasn't invisible.
Any solution will be highly appreciated.
I think your pictureBox1 isn't losing focus, cause it never actually GOT focused. Set it to be focused after making it visible.
Oh, I have encountered this before...
I was making a Label that you could double click and it would allow you to edit the Label.Text, like a TextBox. However, I was having problems hooking into the events to know when the user had clicked off the Control and wished to stop editing. I tried Control.LostFocus, and Control.Leave, but nothing. I even got frustrated/desperate and tried some silly ones like Control.Invalidated.
What I ended up having to do was subscribe to the Click event of the Form/Container/Control behind it.
However, putting the responsibility of wiring up this event into the Form that wants to use it is poor design. What you can do, however is to make the constructor to Control class require a reference to the owner/parent/container as a parameter. That way, the requirements are not hidden, they must be satisfied before you can get a object instance, and the control can wired up to the Form.Click within itself, where that logic belongs.
private Form owner;
public EditLabel(Form Owner)
this.owner = Owner;
owner.Click += EndEditing;
Add this method in designer.cs:
pictureBoxEvent this.MouseLeave += new EventHandler(pictureBox_MouseLeave);
Add this code in cs file:
private void pictureBox_MouseLeave(object sender, EventArgs e)
pictureBox1.Visible = false;

how can closed the TAB page by click?

I am making a Web Browser , I have done some parts like that new tab Page,Bookmark,home page,Default Search Engine and so on. I'm confused about how to closed the TAB PAGE. I have tried Double click , Mouse down, up and many more but I can't solve the problem.
I have create the TABPAGE like that . Thanks in advance waiting reply.....
private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
if (tabControl1.SelectedTab.Text == "+")
foreach (Control item in tabControl1.SelectedTab.Controls)
if (item.GetType() == typeof(WebBrowser))
WebBrowser wb = (WebBrowser)item;
toolStripButton1.Enabled = wb.CanGoBack;
toolStripButton2.Enabled = wb.CanGoForward;
Snapshot my Window form application
Just try disposing of the TabPage. Assuming a button called "Close Tab" on the form:
private void closeTab_Click(object sender, EventArgs e) {
if (tabControl1.SelectedTab != null) {
You will need Javascript to do this. Use window.close():
Note: the current window is implied. This is equivalent:
or you can specify a different window.
function close_window() {
if (confirm("Close Window?")) {
with HTML:
You return false here to prevent the default behavior for the event. Otherwise the browser will attempt to go to that URL (which it obviously isn't).
Now the options on the window.confirm() dialog box will be OK and Cancel (not Yes and No). If you really want Yes and No you'll need to create some kind of modal Javascript dialog box.
Note: there is browser-specific differences with the above. If you opened the window with Javascript (via then you are allowed to close the window with javascript. Firefox disallows you from closing other windows. I believe IE will ask the user for confirmation. Other browsers may vary.
If you have more than one tab, changing tabs should fire the code. Does your markup have runat="server" in the tag declaration?

ToolStripButton "Reset Appearance" / "Fire Leave Event"

I have a ToolStripButton that performs an action. The user clicks the button and the button is disabled to prevent the action being performed twice. After the action is complete the button is re-enabled. It all works perfectly...except:
Because the button is disabled it does not fire the "MouseLeave" event and as a result the appearance of the button is not updated. To be absolutely clear, when the mouse enters a ToolStripButton the button is highlighted in orange (by default) with a black box around it. This highlight is not being removed when I re-enable the button. The mouse cursor is, by this time, long gone from the control. Mousing over the button naturally fixes the button by redrawing it.
What I would like to do would be some method on the ToolStripButton that "resets" its appearance. Such a method may even exist on the ToolStrip, but despite searching I have been unable to find anything like this.
As an alternative I could fire the "Mouse Leave" event on the button directly. As far as I know there is no way to easily do this in C# .NET.
Any advice at this point in time would be most appreciated, naturally I don't want to tear up my application and replace the tool strip.
I reproduced your problem, trying figuring out!
I didn't get a better way other than reset the style in the click event
private void toolStripButton1_Click(object sender, EventArgs e)
toolStripButton1.BackColor = Color.FromKnownColor(KnownColor.Control);
toolStripButton1.Enabled = false;
private void toolStripButton1_MouseEnter(object sender, EventArgs e)
toolStripButton1.BackColor = Color.Red;
private void toolStripButton1_MouseLeave(object sender, EventArgs e)
toolStripButton1.BackColor = Color.FromKnownColor(KnownColor.Control);
Hope this helps!
Have you tried Control.Invalidate()?
from MSDN: Invalidates the entire surface of the control and causes the control to be redrawn.
I had the same problem. I "fixed" it by hiding and then showing back the ToolStripButton using the Visible property after the task was complete.
Before disabling ToolStrip or ToolStripItem:
private void RemoveHighlightFromToolStrip(ToolStrip toolStrip)
foreach (ToolStripItem item in toolStrip.Items)
if (item.Pressed || item.Selected)
item.Visible = false;
item.Visible = true;
also you can just hide and show entire ToolStrip, but this may affect other controls in your form (i.e. if you have some docked DataGridView it would be redrawn)

Focusing WebBrowser control in a C# application

I have a WebBrowser control hosted in a windows Form. The control is used to display hyperlinks which get created at runtime. These links point to some HTML pages and PDF documents.
The problem is that when the form hosting the browser control is loaded, the focus is on the form. When the TAB key is pressed, the focus does not shift to the first hyperlink. However, if I perform a mouse click on the control and then hit the TAB key, the tab focus is now on the first hyper link. I tried using Select() on the WebBrowser control and then I called Focus(), but it doesn't solve the problem.
Any ideas on how to set the tab focus on the first hyperlink at load? Thanks.
I guess it might be because the focus is set before the page is fully loaded. Try this:
private void Go(string url)
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
You could also automatically select the focus on the first link directly by getting the HtmlElement of that first link.
If the above doesn't work, you might want to check other parts of your code to see if anything else is capturing the focus. Try searching for Select, Focus and ActiveControl in your code.
Use form.ShowDialog(form) instead on form.Show(), then it will work !
where form is the running instance of your windows Form
This is my solution
private void txtAdres_KeyPress(object sender, KeyPressEventArgs e)
int licznik = 1;
if (e.KeyChar == (char)13)
string adres = txtAdres.Text;
licznik = 0;
if (licznik == 0)
In a normal scenario it should be sufficient for you to set the TabIndex of the WebBrowser control to zero. This way, when the form loads the control will be focused and pressing TAB will iterate through the links.
Note that you should also change the TabIndex of the other controls on the form.
If this does not solve your problem, you need to add more detail on the complexity of the form hosting the control.

how to set a TabControl tab to be invisible

In C# using VS2005 I have a Winforms TabControl with 7 tabs, but I want the last tab to be only visible if a certain configuration option is set.
How to make the TabControl only show the first six tabs? In other words, how do I make the seventh tab not visible?
private void HideTab(object sender, EventArgs e)
private void ShowTab(object sender, EventArgs e)
this.tabPage2 is your 7th tabpage, whatever name you give it.
No its not possible to hide a tab in tabcontrol. If you are adding the tabs ar run time then dont add 7th tab if condition not satisfied.
If you done in design time then remove the tab if condtion failed.
you can implement a property
public bool TabVisible
return tabControl1.Contains(tabPage2);
if(value == TabVisible) return;
you should also overwrite your disposing function,
you can move out the Dispose function from the designer generated code to your own code, the designer notices that. you see that the components.Dispose(); function can not reach the tabPage any more for disposal, so you need to dispose it manually if it has not been disposed. otherways, especially if you are opening your window many times, you run out of window handles