On page 1Subform_ASubform_BSubform_COn page 2Subform_DWhen click on button_A The layout will be on page 1Subform_ASubform_C (Subform_B is replaced with Subform_C)Subform_D (come from page 2)Again, When click on button_B the layout will beSubform_B (position at Subform_A )Subform_C (position at Subf...