private void btn_left_Click(object sender, EventArgs e)
{
if (SelectedSKUIndex <= 0)
{
return;
}
Label temp = flp_sku.Controls[SelectedSKUIndex - 1] as Label;
flp_sku.Controls.SetChildIndex(flp_sku.Controls[SelectedSKUIndex], SelectedSKUIndex - 1);
flp_sku.Controls.SetChildIndex(temp, SelectedSKUIndex);
SkuComponent tempComp = SkuComponents.ElementAt(SelectedSKUIndex - 1);
SkuComponents[SelectedSKUIndex - 1] = SkuComponents[SelectedSKUIndex];
SkuComponents[SelectedSKUIndex] = tempComp;
SelectedSKUIndex--;
}
