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pnlParent.Height = 300;
Panel pnl_top = new Panel();
pnl_top.Size = new Size(100,150);
pnl_top.BackColor = Color.Blue;
this.pnlParent.Controls.Add(pnl_top);
pnl_top.Dock = DockStyle.Top;
Panel pnl_fill = new Panel();
pnl_fill.BackColor = Color.Red;
this.pnlParent.Controls.Add(pnl_fill);
pnl_fill.Dock = DockStyle.Fill;
MessageBox.Show("pnlParent.Height : " + pnlParent.Height.ToString() + " pnl_fill.Height:"+pnl_fill.Height.ToString());
pnlParent.Height = 300;
Panel pnl_top = new Panel();
pnl_top.Size = new Size(100,150);
pnl_top.BackColor = Color.Blue;
this.pnlParent.Controls.Add(pnl_top);
pnl_top.Dock = DockStyle.Top;
Panel pnl_fill = new Panel();
pnl_fill.BackColor = Color.Red;
this.pnlParent.Controls.Add(pnl_fill);
pnl_fill.Dock = DockStyle.Fill;
pnl_fill.BringToFront();
MessageBox.Show("pnlParent.Height : " + pnlParent.Height.ToString() + " pnl_fill.Height:"+pnl_fill.Height.ToString());
panel1.Height = 600;
panel1.BackColor = Color.Aqua;
Panel pnl_top = new Panel();
pnl_top.BackColor = Color.Blue;
pnl_top.Size = new Size(100, 150);/////////////
this.panel1.Controls.Add(pnl_top);
pnl_top.Dock = DockStyle.Top;
pnl_top.SendToBack();
Panel pnl_fill = new Panel();
pnl_fill.BackColor = Color.Red;
this.panel1.Controls.Add(pnl_fill);
pnl_fill.Dock = DockStyle.Fill;
pnl_fill.BringToFront();
MessageBox.Show("pnlParent.Height : " + panel1.Height.ToString() + " pnl_fill.Height:" + pnl_fill.Height.ToString());
pnlParent.Height = 300;
Panel pnl_top = new Panel();
pnl_top.BackColor = Color.Blue;
this.pnlParent.Controls.Add(pnl_top);
pnl_top.Dock = DockStyle.Top;
pnl_top.SendToBack();
Panel pnl_fill = new Panel();
pnl_fill.BackColor = Color.Red;
this.pnlParent.Controls.Add(pnl_fill);
pnl_fill.Dock = DockStyle.Fill;
pnl_fill.BringToFront();