You have to create a new FlowLayoutPanel
for every tab:
FlowLayoutPanel fl_panel = new FlowLayoutPanel();
...
new_TabPage.Controls.Add(fl_panel);
And then you can cast the first element of the TabPage
to the FlowLayoutPanel
and access the Controls
from there:
FlowLayoutPanel selectedFLP = (FlowLayoutPanel)tabControl.SelectedTab.Controls[0];
...