diff --git a/eeschema/dialogs/dialog_sim_model_base.cpp b/eeschema/dialogs/dialog_sim_model_base.cpp
index 7035518b17..15a6c5f941 100644
--- a/eeschema/dialogs/dialog_sim_model_base.cpp
+++ b/eeschema/dialogs/dialog_sim_model_base.cpp
@@ -72,7 +72,7 @@ DIALOG_SIM_MODEL_BASE::DIALOG_SIM_MODEL_BASE( wxWindow* parent, wxWindowID id, c
 	m_ibisPinCombobox = new wxComboBox( m_modelPanel, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, 0, NULL, wxTE_PROCESS_ENTER );
 	m_ibisPinCombobox->Hide();
 
-	gbSizer1->Add( m_ibisPinCombobox, wxGBPosition( 2, 1 ), wxGBSpan( 1, 1 ), wxEXPAND, 5 );
+	gbSizer1->Add( m_ibisPinCombobox, wxGBPosition( 2, 1 ), wxGBSpan( 1, 1 ), wxEXPAND|wxTOP|wxBOTTOM, 2 );
 
 	m_differentialCheckbox = new wxCheckBox( m_modelPanel, wxID_ANY, _("Differential"), wxDefaultPosition, wxDefaultSize, 0 );
 	m_differentialCheckbox->Hide();
@@ -88,7 +88,7 @@ DIALOG_SIM_MODEL_BASE::DIALOG_SIM_MODEL_BASE( wxWindow* parent, wxWindowID id, c
 	m_ibisModelCombobox = new wxComboBox( m_modelPanel, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, 0, NULL, wxTE_PROCESS_ENTER );
 	m_ibisModelCombobox->Hide();
 
-	gbSizer1->Add( m_ibisModelCombobox, wxGBPosition( 3, 1 ), wxGBSpan( 1, 1 ), wxEXPAND, 5 );
+	gbSizer1->Add( m_ibisModelCombobox, wxGBPosition( 3, 1 ), wxGBSpan( 1, 1 ), wxEXPAND|wxALIGN_CENTER_VERTICAL|wxTOP|wxBOTTOM, 1 );
 
 
 	gbSizer1->AddGrowableCol( 1 );
diff --git a/eeschema/dialogs/dialog_sim_model_base.fbp b/eeschema/dialogs/dialog_sim_model_base.fbp
index b81b9b0bf3..064cd6f990 100644
--- a/eeschema/dialogs/dialog_sim_model_base.fbp
+++ b/eeschema/dialogs/dialog_sim_model_base.fbp
@@ -699,10 +699,10 @@
                                                         </object>
                                                     </object>
                                                     <object class="gbsizeritem" expanded="1">
-                                                        <property name="border">5</property>
+                                                        <property name="border">2</property>
                                                         <property name="colspan">1</property>
                                                         <property name="column">1</property>
-                                                        <property name="flag">wxEXPAND</property>
+                                                        <property name="flag">wxEXPAND|wxTOP|wxBOTTOM</property>
                                                         <property name="row">2</property>
                                                         <property name="rowspan">1</property>
                                                         <object class="wxComboBox" expanded="1">
@@ -905,10 +905,10 @@
                                                         </object>
                                                     </object>
                                                     <object class="gbsizeritem" expanded="1">
-                                                        <property name="border">5</property>
+                                                        <property name="border">1</property>
                                                         <property name="colspan">1</property>
                                                         <property name="column">1</property>
-                                                        <property name="flag">wxEXPAND</property>
+                                                        <property name="flag">wxEXPAND|wxALIGN_CENTER_VERTICAL|wxTOP|wxBOTTOM</property>
                                                         <property name="row">3</property>
                                                         <property name="rowspan">1</property>
                                                         <object class="wxComboBox" expanded="1">