to center TabPage Scroll Bar

TabPage page = new TabPage( );

page.AutoScroll = true;

Button btn = new Button( );

btn.Text = "Add label";

btn.Click += delegate

Label lbl = new Label( );

lbl.Location = new Point( 0, 100 );

lbl.Anchor = AnchorStyles.Left;

lbl.AutoSize = false;

lbl.Width = this.Width + 400;

lbl.BackColor = Color.Red;

lbl.TextAlign = ContentAlignment.MiddleCenter;

lbl.Text = "centered text";

if ( lbl.Width > page.Width )

page.AutoScroll = false;

page.AutoScroll = true;

TabControl tabCtrl = new TabControl( );

tabCtrl.Dock = DockStyle.Fill;

this.Controls.Add( btn );

this.Controls.Add( tabCtrl );