diff --git a/src/components/main_window.rs b/src/components/main_window.rs
index 39d56cd..fc9d5bd 100644
--- a/src/components/main_window.rs
+++ b/src/components/main_window.rs
@@ -1,12 +1,33 @@
 #![allow(non_snake_case)]
 use yew::prelude::*;
+use yewdux::prelude::*;
+
+use super::states::{MainState, NewTransferState};
 use super::plates::plate_container::PlateContainer;
 use super::tree::Tree;
 use super::transfer_menu::TransferMenu;
 use super::new_plate_dialog::NewPlateDialog;
 
+use crate::data::plate_instances::PlateInstance;
+
 #[function_component]
 pub fn MainWindow() -> Html {
+    let (main_state, main_dispatch) = use_store::<MainState>();
+    let (selection_state, selection_dispatch) = use_store::<NewTransferState>();
+
+    let source_plate_instance = main_state.source_plates.iter()
+        .find(|spi| {spi.get_uuid() == selection_state.source_id});
+    let source_dims = match source_plate_instance {
+        Some(spi) => Some(spi.plate.size()),
+        None => None,
+    };
+    let destination_plate_instance = main_state.destination_plates.iter()
+        .find(|dpi| {dpi.get_uuid() == selection_state.destination_id});
+    let destination_dims = match destination_plate_instance {
+        Some(dpi) => Some(dpi.plate.size()),
+        None => None,
+    };
+
     let new_plate_dialog_is_open = use_state_eq(|| false);
     let new_plate_dialog_callback = {
         let new_plate_dialog_is_open = new_plate_dialog_is_open.clone();
@@ -25,7 +46,7 @@ pub fn MainWindow() -> Html {
         <div class="main_container">
             <Tree open_new_plate_callback={open_new_plate_dialog_callback}/>
             <TransferMenu />
-            <PlateContainer source_dims={(24,16)} destination_dims={(24,16)}/>
+            <PlateContainer source_dims={source_dims} destination_dims={destination_dims}/>
             if {*new_plate_dialog_is_open} {
             <NewPlateDialog close_callback={new_plate_dialog_callback}/>
             }
diff --git a/src/components/plates/plate_container.rs b/src/components/plates/plate_container.rs
index bb9186d..cd2c02f 100644
--- a/src/components/plates/plate_container.rs
+++ b/src/components/plates/plate_container.rs
@@ -1,25 +1,29 @@
 #![allow(non_snake_case)]
 use yew::prelude::*;
-use yewdux::prelude::*;
-use super::super::states::MainState;
 
 use super::source_plate::SourcePlate;
 use super::destination_plate::DestinationPlate;
 
 #[derive(Properties, PartialEq)]
 pub struct PlateContainerProps {
-    pub source_dims: (u8,u8),
-    pub destination_dims: (u8,u8)
+    pub source_dims: Option<(u8,u8)>,
+    pub destination_dims: Option<(u8,u8)>,
 }
 
 #[function_component]
 pub fn PlateContainer(props: &PlateContainerProps) -> Html {
-    let (state, dispatch) = use_store::<MainState>();
-
     html! {
         <div class="plate_container">
-            <SourcePlate width={props.source_dims.0} height={props.source_dims.1} />
-            <DestinationPlate width={props.destination_dims.0} height={props.destination_dims.1} />
+            if let Some((w,h)) = props.source_dims {
+            <SourcePlate width={w} height={h} />
+            } else {
+                <h2>{"No Source Plate Selected"}</h2>
+            }
+            if let Some((w,h)) = props.destination_dims {
+            <DestinationPlate width={w} height={h} />
+            } else {
+                <h2>{"No Destination Plate Selected"}</h2>
+            }
         </div>
     }
 }
diff --git a/src/components/tree.rs b/src/components/tree.rs
index 3fd0a3b..6638b16 100644
--- a/src/components/tree.rs
+++ b/src/components/tree.rs
@@ -9,6 +9,7 @@ use yewdux::prelude::*;
 use crate::data::{plate_instances::PlateInstance, transfer::Transfer};
 use crate::data::plate::*;
 use crate::components::states::{MainState, NewTransferState};
+use crate::components::transfer_menu::RegionDisplay;
 
 #[derive(PartialEq, Properties)]
 pub struct TreeProps {
@@ -57,7 +58,10 @@ pub fn Tree(props: &TreeProps) -> Html {
             let li = target.and_then(|t| t.dyn_into::<HtmlElement>().ok());
             if let Some(li) = li {
                 if let Ok(id) = u128::from_str_radix(li.id().as_str(), 10) {
-                    dispatch.reduce_mut(|state| state.source_id = Uuid::from_u128(id))
+                    dispatch.reduce_mut(|state| {
+                        state.source_region = RegionDisplay::default();
+                        state.source_id = Uuid::from_u128(id);
+                    })
                 }
             }
         })
@@ -69,7 +73,10 @@ pub fn Tree(props: &TreeProps) -> Html {
             let li = target.and_then(|t| t.dyn_into::<HtmlElement>().ok());
             if let Some(li) = li {
                 if let Ok(id) = u128::from_str_radix(li.id().as_str(), 10) {
-                    dispatch.reduce_mut(|state| state.destination_id = Uuid::from_u128(id))
+                    dispatch.reduce_mut(|state| {
+                        state.destination_region = RegionDisplay::default();
+                        state.destination_id = Uuid::from_u128(id);
+                    })
                 }
             }
         })
diff --git a/src/data/plate.rs b/src/data/plate.rs
index ed70d3a..6a08b9a 100644
--- a/src/data/plate.rs
+++ b/src/data/plate.rs
@@ -54,14 +54,14 @@ impl std::fmt::Display for PlateFormat {
 impl PlateFormat {
     pub fn size(&self) -> (u8, u8) {
         match self {
-            PlateFormat::W6 => (2, 3),
-            PlateFormat::W12 => (3, 4),
-            PlateFormat::W24 => (4, 6),
-            PlateFormat::W48 => (6, 8),
-            PlateFormat::W96 => (8, 12),
-            PlateFormat::W384 => (16, 24),
-            PlateFormat::W1536 => (32, 48),
-            PlateFormat::W3456 => (48, 72),
+            PlateFormat::W6    => (3, 2),
+            PlateFormat::W12   => (4, 3),
+            PlateFormat::W24   => (6, 4),
+            PlateFormat::W48   => (8, 6),
+            PlateFormat::W96   => (12, 8),
+            PlateFormat::W384  => (24, 16),
+            PlateFormat::W1536 => (48, 32),
+            PlateFormat::W3456 => (72, 48),
         }
     }
 }