Add an Icon to Your Extension's Tab

Updated on Nov 6, 2025

Use an Existing Icon

Set the .ImageIndex property as follows:

public void OnLoad()
{
	oPage = new TabPage("Timeline");
	oPage.ImageIndex = (int)Fiddler.SessionIcons.Timeline;
	oView = new TimelineView();
	oPage.Controls.Add(oView);
	oView.Dock = DockStyle.Fill;
	FiddlerApplication.UI.tabsViews.TabPages.Add(oPage); 
}

Add a Custom Image

Add the image to imglSessionIcons.
Set the .ImageIndex property as follows:

public void OnLoad()
{
	oPage = new TabPage("Timeline");
	oPage.ImageIndex = (int)Fiddler.SessionIcons.Timeline;
	oView = new TimelineView();
	oPage.Controls.Add(oView);
	oView.Dock = DockStyle.Fill;
	FiddlerApplication.UI.tabsViews.TabPages.Add(oPage); 
}