private void PrepareTabPages()  //Loop through the tabpages and create 2 panels per tabpage
{
    for (int Tabcount = 0; Tabcount <= TabCtrl.TabCount - 1; Tabcount++)
    {
        CreateBottomPanel(Tabcount);  //Create a panel per tabpage
        CreateChartPanel(Tabcount);
    }
}

private void CreateBottomPanel(int Tabcount)
{
    Panel BottomPanel = new();
    BottomPanel.Name = "BottomPanel";
    BottomPanel.Text = string.Empty;
    BottomPanel.Location = new Point(3, 50);
    BottomPanel.Size = new Size(50, 32);
    BottomPanel.BackColor = Color.Firebrick;            

    PlaceControleOnSpltcontainerOne(BottomPanel, Tabcount);
}

private void CreateChartPanel(int Tabcount)

{
    Panel ChartPanel = new();
    ChartPanel.Name = "ChartPanel";
    ChartPanel.Text = string.Empty;
    ChartPanel.Location = new Point(3, 50);
    ChartPanel.Size = new Size(50, 32);
    ChartPanel.BackColor = Color.ForestGreen;
    ChartPanel.BorderStyle = BorderStyle.Fixed3D;            

    PlaceControleOnSpltcontainerOne(ChartPanel, Tabcount);
}

private void PlaceControleOnSpltcontainerOne(Control NewCntrl, int Tabcount)
{
    TabPage tp = TabCtrl.TabPages[Tabcount];
    foreach (Control c in tp.Controls)
    {
        if (c.GetType() == typeof(SplitContainer))  //is a splitcontainer 
        {
            SplitContainer splt2 = (SplitContainer)c;

            splt2.Panel2.Controls.Add(NewCntrl);

            if (NewCntrl.Name == "BottomPanel")
            {
                NewCntrl.Dock = DockStyle.Bottom;                        
            }
            if (NewCntrl.Name == "ChartPanel")
            {
                NewCntrl.Dock = DockStyle.Fill;                    
            }                    
        }
    }
}